gas mileage?? only getting 230 miles a tank (14 mpg)???

[Anthonysflying]

+1 For maintenance! A dirty air filter will screw up your mileage as well as your plugs...which will also screw up your mileage. Dirty oil will eventually become abrasive and kill your mileage as well as your motor.

Chances are you do a lot of city driving. Not much you can do there. all that high mileage talk is highway driving. To find out what your really doing, switch over to your MPG screen with the top button, then hold down the bottom button to reset the average numbers. good stuff to play with since you can find out what the aforementioned sweet spot is for your car, or you can feel cool like Rs350z there and reset it while rolling in neutral. I think the max that will fit on the screen is 99.9 mpg.

Driving style affects a large portion of it, but in the end you're at the mercy of your environment. Hills, valleys, flat stretches, traffic, road quality etc.

There is no need to reflash the ECU. The whole problem is a stock car not performing like a stock car. If you want to stretch it though, the previous owner may have tracked the s**t out of it right out of the showroom. Anybody think an ECU relearn might help?

[marlin29311]

There is no need to reflash the ECU. The whole problem is a stock car not performing like a stock car. If you want to stretch it though, the previous owner may have tracked the s**t out of it right out of the showroom. Anybody think an ECU relearn might help?

Can't hurt any - Unplug your battery for 15-20 mintues, as this should reset the ECU - then for the next couple 100 miles drive easy, letting the ECU know that you want to save fuel, not burn rubber.

[PapaSmurf2k3]

but the cobb accessport tuner can put back the stock maps so it dosent void right.

I wouldn't be surprised if they could find out about it. I know I could do it if I worked on 350s all day and then you brought me one running on lean maps.

[zozoka1212]

Driving like a maniac eh? LOL

I chime in too. This cold we have (not far from you Guelph) I drive to work about 10km(other side of the town). I warm up my car for about 3-4 minutes at home from the garage and at work the car is outside and warm it up for about 7-8 minutes. To get home takes less time than warm up the car. I am getting with the last fill up about 17 l/ 100km (13.8 mpg). LOL I drive like a maniac for sure. All I know is gas and brake. Summer this improves by a lot it goes around 12-13 (18-19 mpg) l/100km. Same driving style.

Now all these figures change quite a bit when my wife drives the car. She drove it for a week I needed her car and the cargo space. She works 3 buildings away from my work. She ended up getting 9l/100km (26mpg) . Hwy I'vw got 12-13l /100km (18-19) and she gets 8l/100km (29.3mpg). She never goes above 3k rpm in any gears.

I've got the car back after a week and felt slow. Her driving changed the ECU and TCU quite a bit. I had to reset it to go back to normal. LOL

If you want to improve your milage all you have to do is change your driving habits. Try to slow down before the lights without the brake try to accelerate lightly.

Cold air intake won't give you any better mpg. I had it on my 07 and change nothing but had a smile on my face from the sound. Also you can improve more if you keep your tire pressure properly. Little higher will give you little better. Also once you buying a new set of tires try to look for a roll resistance rating on the tires. They can varry by 15%.

But be honest with you. Just enjoy your car. There is a reason why you buy a 300hp car. Use every single hp you get. The smile it puts on my face when I floor it makes a different. $20.00 on the tank of gas well not much. If I really wanted to save gas I would of end up with a Prius.

Probably most of you already seen the TG episode when they play a little m3 vs prius on mpg. That explains everything you need to know.

http://www.youtube.com/watch?v=ydvAQ6Y49vc

It doesn't matter what you drive it matters how you drive it.

zozo

edited to include mpg ratings for all the Ami's-Papasmurf2k3

[ldstang50]

That's not hyper mileing, that'd drafting - they're completely different, and following a semi 2-3 feet back is the dumbest thing you can do on the road, and hopefully if you do it a cop catches you and tickets you for tailgating.

Hyper mileing is coasting as much as possible before coming to a stop.

OP - you want better gas mileage? Here's how:

Don't bring your RPM's over 2500 when accelerating. Do as much driving at one time as possible, as your car runs more efficent over longer periods of use instead of short runs. Consider using a higher viscosity/synthetic oil.

The term hypermiling became famous over this past summer when American gas prices shot through the f#cking roof. Hypermiling is not just one thing, its a combination of doing things while driving. Hypermiling is extreme and in some cases dangerous ways to improve your gas mileage.One being what Richie mentioned, drafting off trucks. In an episode of MythBusters they did and experiment with drafting on tractor trailers. At 55mph with a new Dodge Charger or something similar, at 20' away from the truck, they're gas mileage was something like 50% better than plain driving. It works, but its dangerous and illegal.Inflating your tires above what the manufacturer recommends will help improve gas mileage but make your car more dangerous being that your stopping distances will be increased, the car will feel bouncier and probably handle worse.Coasting through stop signs...saves gas but is also illegal.

The best ways to improve your gas mileage (besides driving slower and not accelerating as hard) are to keep up with maintance; changing your oil regularly, cleaning your air filter, and RUNNING THE CORRECT TIRE PRESSURE. I can't believe no one has mentioned that yet.Coasting up to stop lights and intersections will help along with staying further behind people. This will allow you to be smoother with the gas instead of jumping constantly from brake to gas.

[C-Kwik]

its not really weather u drive slow or fast its more of smart driving not giving it gas when ur a lil bit away from a stop sign shifting at slow rpms drafting ect proof of smart driving is in my pix.

I can easily get my Titan's mpg computer to read 59.9 mpg as well. Just hit the reset button as I'm coasting down from a higher speed. THe real-time meter only goes up to 30 mpg, but I'm sure if it could display more, it would be some absurd number. Your picture proves nothing.

[zozoka1212]

^+1

PapaSmurf2k3 thanks for editing. I totally forgot to ad the mpg. I usually post it in mpg maybe that's why.Thanks again.

+1 on all ldstang50 said.

zozo

[maximus108]

Going to sound funny but if you keep your car looking all shiny, wash/wax/polish, you get better mileage. I saw this when I was at the movie theater waiting for the movie to start. It said you can get upto 7% better mileage.

Everyone I tell this to looks at me like, "yeaaaahhhhh..."

Here's a little link that supports the moive theater's claim:http://autorepair.about.com/b/...n.htm

[xjmxstac]

OP...I could imagine that you do mostly street driving as opposed to freeway driving. I average about 24 mpg freeway and street combined. street, about 14-18. Freeway about 24-30. Only driver mods can truly help you with gas mileage. Ease up on your foot while accelerating and stay under 65mph if that's at all possible driving a 350z...haha good luck!

[lucsious]

my car has 47000 miles on it

[aris_unlimited]

27mpg? Do you drive like a granny? I'm getting 21-22 on the hwy. Maybe 23 if I keep the speed down. I know the slightly different Cd and 200lbs isn't making that big of a difference.

I most certainly don't drive like a granny. On the highway I usually average between 70-80 mph depending on my mood. I drove from my town in Utah to San Diego in california going 90-100mph the whole time and still averaged 25 mpg lol. Maybe my mods have something to do with it, but I doubt it would make that big of a difference.

[lucsious]

thanks im not so worried about my gas mileage as where getting the same amount of mpg,

[bmike818]

how about a dirty fuel filter? Wow you are getting really low mpgs with your Z. I thought mine was bad at 23mpg, that's with highway driving.

Goodluck! keep us posted.

[Sentientbydesign]

how about a dirty fuel filter? Wow you are getting really low mpgs with your Z. I thought mine was bad at 23mpg, that's with highway driving.

Goodluck! keep us posted.

Newer nissans only have the screen filter that's built into the fuel pump. They did away with the engine bay one.

On a side note: When I replaced the fuel filter on my I30, nothing happened. Just a huge waste of time

[PapaSmurf2k3]

a fuel filter would have to be really dirty to not work, and even then, it would only affect the car's max performance, not gas mileage. Think about it, dirty fuel filter would limit the ammount of fuel going to the engine, and you use the most fuel at max rpms with the throttle wide open.

[lucsious]

ok so i decided to hit the reset button for the mpgand its started to act proper believe it or not..lolhighway i was averaging 20-23 mpg yay!... but still 230-250 miles per tank does that sounds right.?? how many gallons does the z tank hold??

[PapaSmurf2k3]

well its definitely larger than 12 gallons (by doing some quick math based on your mpg...)You should be cracking 300 easily.

[raremotive]

ok so i decided to hit the reset button for the mpgand its started to act proper believe it or not..lolhighway i was averaging 20-23 mpg yay!... but still 230-250 miles per tank does that sounds right.?? how many gallons does the z tank hold??

Here's a trick.. don't look at the gauge, it's only calculates average MPG.

What you need to do is fill up the tank completely. And reset your trip odometer. (Assuming you still have stock tire size and proper tire pressure)

The next time you fill up completely, the gas meter will tell you how much it has put in. You take that number and divide it by your trip odometer number. It will give you a very rough estimate of your true MPG or KMPL if you like.

Your car is getting close to 50k miles, that's usually good time to do some maintenance and change out some routine parts. Your owner's manual you tell you a service time line based on milage and which parts you should replace to keep the vehicle in it's prime.
Modified by Rare_f8 at 9:18 PM 1/23/2009

[R350Zz33]

its a 20 gallon tank. and to the person who said thats drafting not hyper mileing, hyper mileingis not one thing but all thoses things combined shifting early drafting turning engine off at stop coasting coasting with the engine off ...... look it up bud

[raremotive]

its a 20 gallon tank. and to the person who said thats drafting not hyper mileing, hyper mileingis not one thing but all thoses things combined shifting early drafting turning engine off at stop coasting coasting with the engine off ...... look it up bud

Turning off engine consumes more gas since it has to put extra fuel to light up those cylinders again.

Coasting on the other hand, the engine ecu will detect that you are not on the throttle and trim the fuel from the engine.

I drive spirited and smart. And I enjoy it and it's pays off.

[aris_unlimited]

its a 20 gallon tank. and to the person who said thats drafting not hyper mileing, hyper mileingis not one thing but all thoses things combined shifting early drafting turning engine off at stop coasting coasting with the engine off ...... look it up bud

Seriously, can you expect anyone to honestly believe anything you say with all the blather that comes spewing out of your piehole. It is obvious that you don't know as much about cars as you think you do. Your time here could best be spent learning and not throwing out random bs thoughts that cannot be proved.

[bmike818]

a fuel filter would have to be really dirty to not work, and even then, it would only affect the car's max performance, not gas mileage. Think about it, dirty fuel filter would limit the ammount of fuel going to the engine, and you use the most fuel at max rpms with the throttle wide open.

...note taken

[R350Zz33]

if you don't believe me then google it. and yes it takes alot of fuel to start an engine a fuel injected engine the amount of fuel used to start it is = to about 10-20 seconds of idling. so shutting it off at stops only pays off if you know that its a long stop. EX those 2-3 min stop lights.

[lucsious]

never got an owners manual...if you have one could you tel me what it says should get done at the 50000 mark

[PapaSmurf2k3]

50k is nothing special. The big one comes at 60-65k. It includes (IIRC): gear oil change, rear diff oil change, radiator fluid change, air filter change, oil & filter change, and some checkups, etc. I think the spark plugs last 100k but I could be mistaken...

EDIT: here you go: http://www.nissanextendedwarra....html

[lucsious]

thank ya

[lucsious]

[rmezz13]

Is a 20 gallon tank but has a 7 gallon reserve, i believe, so full to empty is 13 gallons. Your MPG's may be correct. Also sometimes when filling my Z which i usually don't fill it all the way, but when i have it often shuts the pump off early and it may take me a few times but i can usually get it to start auto pump again and get another 3-4 gallons, but if i stop then it may still read full even though i could get more in it. Just like when the fuel light comes on there is still 7 gallons left (roughly).

Get it?

What i am saying is when yor tank reads empty (your 20 gallon tank) there is still about 7 gallons left (reserve) so when reading empty you've essentially used about 13 gallons, and an average of 18 MPG's = 12.78 gallons if 230 miles were achieved. So your tank mileage is about right if your average over all was 18mpg.

*Take the miles achieved (230) divided by average MPG (18) and your result is gallons used (12.777777777777 or 12.78)

[raremotive]

50k is nothing special. The big one comes at 60-65k. It includes (IIRC): gear oil change, rear diff oil change, radiator fluid change, air filter change, oil & filter change, and some checkups, etc. I think the spark plugs last 100k but I could be mistaken...

EDIT: here you go: http://www.nissanextendedwarra....html

I work with a 50k, 100k, 150k system. So manufacture says 40 or 60.. it's 50k miles. Ultimately, you think about it it's a rough guide of when. But if you want to get technical.. it's 60k or 48 months. 04 roadster, 48/12 = 4 years.. yup it's time.

Spark plugs are so cheap, $3 to $10 a pop. I do not see a reason why not replace them at each 50k interval.

But good linky.

just to add...

When the light comes one, you have 3 gallons or 14 liters left of fuel, says so in the owner's manual.

conversion factor for kmpl to mpg is .4251

MPG = KMPL/.4251

Also, you sure your owner's manual not hidden behind the passenger seat bin?

anyways...I recommend to save a copy on your computer..http://www.cliffshade.com/350z...4.pdf

This does not have the service schedule with it, but it will tell you about your car.
Modified by Rare_f8 at 3:23 PM 1/24/2009

[XterraVersa]

Is a 20 gallon tank but has a 7 gallon reserve, i believe, so full to empty is 13 gallons.

The newer Z's must be different. My low fuel light kicks in with about 3 gallons left at around 380-420 miles.