Unbelievable Gas Mileage

[Jacko3]

I know we have discussed this before, but I went out this afternoon to test my gas mileage after almost 2 months of flogging the car with new mods, and new tires. Again, while some many agree, I still relied on the cars on board fuel mileage calculator which is built into the GPS system.

Average fuel economy on first reading on highway driving was 28.2 miles per gallon. I had to reset the calculator and then I drove another 30 miles under normal throttle to get a better reading. Well, the best I achieved on the highway was 27.2 MPG and the worst I achieved was 25MPG.

Under WOT on highway, I found i was achieveing an average of 23MPG.

However, this data changes drastically with city driving under WOT, where I achieve just 18MPG. Under regular city driving, I was unable to achieve anything beyond 22MPG.

Of course I will like to remind anyone reading that I have a 5/16" spacer, Mrevv2, Stillen TD Catback exhaust, and JWT Popcharger with Z-tube. And more recently, I now have the Toyo Proxes T1R tires (excellent) installed. Of course, I use Mobil 1 Synthetic 5w-30 oil. Of course, I use 93 Octane Gas.

With Good Year Potenza RE0050A tires, even when I had the mods, I have never been able to achieve anything beyond 26MPG on highway driving, and even then that was almost rare.

What i am saying here is that the mods do make a difference and the type of tires and gas you use may also matter. Just wanted others to know what the G-35 Coupe is capable of achieving with mods.

My car is a 2007 G-35 Coupe 6MT with NAV, and Rear Active Steer. I bet when I add the non-underdrive pulleys, the gas mileage would evn become better. so, good gas mileage is possible with the G-35.

Again, time after time, I keep asking why Infiniti skimped on so many things to make the G-35 Coupe affordable? I am of the belief that if Infiniti had used more quality parts, the cost of the G-35 Coupe in the US would have topped $45K. Infiniti just handed us a car that they knew was intended to be moded out, if we really want to experience the real capability of the 350Z and G-35 Coupe. I have been saying this for months. Again, a SC or a TT maybe required to bring this car to its true capabilities. The car is highly capable of more than what was noted in the manual.

What do you think?

[telcoman]

I know we have discussed this before, but I went out this afternoon to test my gas mileage after almost 2 months of flogging the car with new mods, and new tires. Again, while some many agree, I still relied on the cars on board fuel mileage calculator which is built into the GPS system.

What do you think?

Jacko buddy

You are not getting a true and accurate reading.

Fill your tank. Set the odometer A to zero

Drive your G like you usually do until the fuel reaches the 1/4 mark.

Refill your tank. Record the total miles traveled divided by the number of gallons it took to fill up.

Post results. This is the only accurate method for calculating MPG. After the pump clicks off I usually round up to the nearest dollar or $.50 so it evens out over time.

Telcoman

[BrandAidDesignG35]

I agree with Telcoman, that's an acurate way to test...

But I am encouraged by the unofficial results of Jacko... I'll plan to continue my work into the G, and race this spring/summer... I think I've improved my gas mileage by installing a tin heat shield... it's going to be replaced by the hks style heat shield, and I have a Greddy EVO II on the way I think we all want better MPG as far as I can tell, but why not make it faster in the process I get 600km per tank with below mods... (exhaust on the way)...

I say keep it up!

[Sentientbydesign]

Jacko, Telco,

Let's compromise. I know Jacko, doesn't like the idea of wasting gas for the sake of MPG calculation, so how about this. Fill her up. Reset the trip odometer and drive 50-100 miles. Then fill her up again and record both the fuel displacement as well as the number of miles driven.

Do the math and come back with the results.

I drove 383 miles on Friday and Saturday. I calculated my MPG to be 22.8 with 81% spirited FWY driving (mostly going 80) and 19% city driving (lots of stop and go topping out at around 45-50).

My previous estimates of city driving (exact same terrain and streets as the 19%) have yielded results between 16.8 and 19 MPG.

If I estimate that I was getting 17.5 MPG for the 72.77 miles that I drove on Saturday, then my HWY MPG comes out to 24.13.

In addition to other various errors, there is an odometer error estimated to be 1.18% (I have 255/40/19s on the rear). As such, the corrected MPG would be 24.41 MPG.

I find Jacko's findings to be off only because I've driven an 07 auto sedan with NAV and it reported MPG lower than 10 while accelerating.

[smockers83]

The nav unit is probably the worst way (and very laughable way) to calculate MPG as all it probably does is try to measure fuel use constantly and averages it out based on time using a time-weighted average or some sort of weighted average. That's probably next to impossible to get an accurate reading that way. That would be my guess.

Go with everyone else to measure your MPGs. Fill it up and drive and then fill up again and do the math. To make sure you've filled up the same amount each time is to fill up until the auto-shutoff engages, then go once or twice more but you have to do the same on both fill-ups. This is probably the most accurate way to make sure you have the same amount without getting the measuring cup or putting it on a scale.

[numskul]

I think I would like your opinion on which rims would look best on my G...

Fuel economy is very low on my list of requirements for this car. I also think it would take a long time to recoup the money spent on the mods by increasing economy a few miles per gallon. Good speed mods don't require any additional justification and the best of them can get away with a slight reduction in fuel economy.

Interesting experiment, though. I agree with the others that there is a better way to measure your results.

[Sentientbydesign]

I think I would like your opinion on which rims would look best on my G...

Fuel economy is very low on my list of requirements for this car. I also think it would take a long time to recoup the money spent on the mods by increasing economy a few miles per gallon. Good speed mods don't require any additional justification and the best of them can get away with a slight reduction in fuel economy.

Interesting experiment, though. I agree with the others that there is a better way to measure your results.

I'd suggest you post a new thread instead of thread jack on a totally unrelated subject. Sorry if that sounds harsh, it's not meant to be.

Beancooker posted some pics of wedsports and gram lights in another recent thread.

[C-Kwik]

My experience in the G35 and the Titan (both with NAV systems) is that the fuel mileage computer is fairly accurate. Where I've noticed it is not is right after you reset it as the sample is so small that you can seriously manipulate it by playing around with the throttle. Reset it once you are at speed in the highway and maintain low throttle for a few miles and even my Titan will appear to have decent mileage. Conversely, I can easily get it to register some 5 mpg if I reset it right before accelerating hard off the line. However, after driving a distance after resetting, it becomes much more steady. The problem here is it does not adjust to immediate changes in gas mileage quickly as it is still considering the old gas mileage in the average.

The most accurate way to measure this is to do it blindly. Say mod the car with said mods without the owner's knowledge (realistically hard to do with some of the parts as they make more noise), then log the gas mileage. This way the driver doesn't alter their driving to either try to get better fuel mileage or use the additional power the mods may be providing.

[rn79870]

If you want to get good mileage, try setting the crusie control at or below 65. The mileage isn't bad, but everything on the road passes you, even the big trucks.

(personally, I think our friend Jacko is solely responsible for the current oil crisis - using all the gas he does flogging his G. )

[ImpliedConsent]

If you want to get good mileage, try setting the crusie control at or below 65. The mileage isn't bad, but everything on the road passes you, even the big trucks.

(personally, I think our friend Jacko is solely responsible for the current oil crisis - using all the gas he does flogging his G. )

AAACCKKK... /faint

I don't see the numbers "65" on my dash. It starts at "0" ...and the next number is "70". Do you have a special G?

[rn79870]

I know what you mean. Driving a G under 70mph is harder than scoring with Miss April.

[Sentientbydesign]

I know what you mean. Driving a G under 70mph is harder than scoring with Miss April.

I kind of have to disagree. Driving my old I30 under 80 was hard. 80 was at 2700 RPMs.

In the G, it took me a while to drive over 80. I was so used to keeping the RPMs down, and 80 in 6th was at an uncomfortable position.

So now, I just ride 5th to 80, and shift above 80

[Jacko3]

rn79870:

I agree completely! I am guilty of using so much gas! Can youy forgive me for my disdian for the environment?

[Jacko3]

Sentientbydesign:

Nice idea and compromise! Telcoman, what do you think?

[Jacko3]

rn79870:

Yep! You are right! Before I had the mods, my best gas mileage was always below or at 3,000RPM. After the mods, I found that I was getting the same or better gas mielage at 4,000RPM - 4500RPM. I didn't beleive it in the beginning, but now I am a big beleiver in moding a car, not just for power, but also for gas conservation. In fact, If i took time to tune the car, I bet i would get even better gas mileage as well.

[rn79870]

Well Jacko, before your mods I was paying 3 something a gallon. Maybe $3.25. Now, after your mods, I'm paying close to $4.00 a gallon. I'ts got to be someone's fault, might as well be yours.

[Jacko3]

rn79870:

That's right!

[telcoman]

Sentientbydesign:

Nice idea and compromise! Telcoman, what do you think?

I think I found your brother who also is in love with his car & he's in deep $hit

http://www.sun-sentinel.com/ne...story

Telcoman

[rn79870]

I'm disappointed telcoman, you couldn't find anything with a Mustang in it?

[SVTCOBRA]

I'm disappointed telcoman, you couldn't find anything with a Mustang in it?

Mustang or HEMI!!!

[Jacko3]

Telcoman, this guys ricer, has no ABS or Brake Assist , and Brake Force Distribution, like my lovely G. My G would have stopped on a dime.

[numskul]

lol