CHATROOM: MPG 1st & 2nd Gen

[RO-G]

^^^^Philipa,

The calculation below is what I used to convert 11.5 km/liter to 27 mpg.

11.5 km/liter x 3.78 liter/gal x 1 mile/1.609km.

I don't see anything off in the conversions I used in the above equation.

Can you please tell me what part of the above equation is wrong?

Thanks.

[Pescakl1]

Did you do 11.5 km per liter or 11.5 liters for 100 kms?

km/liter is not really a unit used around here

MPG for imperial guys (US), LHK (or l/100kms) for... the rest of the world

I think even in UK, they use the metric system now.

[RO-G]

^^^^^

I know when you look at the fuel consumption rating of vehicles on the internet or dealerships, they use liter/km.

But in my case, instead of using liter/km, I used 11.5 km/liter. It's metric also. I got this from the number of kilometers I travelled on a full tank divided by the number of liters I put in on the next fill up.

[philipa_240sx]

But in my case, instead of using liter/km, I used 11.5 km/liter.

Ah, now I see what you did. Your calculation is correct then.

In the future however, please post your mileage as either l/100km or US mpg. This way we can avoid any confusion.

[RO-G]

Ah, now I see what you did. Your calculation is correct then.

In the future however, please post your mileage as either l/100km or US mpg. This way we can avoid any confusion.

In my opinion, if the American posting for mileage in this forum is MPG (miles per gallon), the Canadian mileage should be posted as KPL (kilometers per liter) which was what I did. Now, if the American mileage is posted on this forum as Gallon/100Miles, then it is right to post L/100Km for the Canadian mileage.

[philipa_240sx]

In my opinion, if the American posting for mileage in this forum is MPG (miles per gallon), the Canadian mileage should be posted as KPL (kilometers per liter) which was what I did.

Yes, that would make 'logical sense', but no-one else uses km/l. The metric standard is l/100km. This is what the mfg's, government, car magazines, etc throughout the world use.

Dealing with mpg and l/100km conversions are confusing enough... we don't need to add a 3rd measurement.

[ahhbeebee]

Latest tank: 7.96L/100km - 29.75MPG

A combination of summer gas, and a recent speeding ticket has me getting great mileage again after somewhat mixed results in the winter.

FYI: I still keep track of km/L (just don't post them)

[RO-G]

Yes, that would make 'logical sense', but no-one else uses km/l. The metric standard is l/100km. This is what the mfg's, government, car magazines, etc throughout the world use.

Dealing with mpg and l/100km conversions are confusing enough... we don't need to add a 3rd measurement.

Agreed.

[RO-G]

Latest tank: 7.96L/100km - 29.75MPG

A combination of summer gas, and a recent speeding ticket has me getting great mileage again after somewhat mixed results in the winter.

FYI: I still keep track of km/L (just don't post them)

Just a suggestion ... I think it would be better if forum members also post the total mileage reading of their Rogue at the time the fuel mileage is taken.

[ahhbeebee]

All within the City, but roughly 70% Highway:30% City (cruising at 85 km/h - 1600RPM - cruise control)

23756km - total mileage

1 yr 1.5 months38th tank of gasMobil1 5W30 (for those who think it matters)

Worst tank ever (Nov 08) = 10.89L/100km (21.74MPG)Best tank ever (Jul 08) = 7.00L/100km (33.83MPG)

Most of this info is buried somewhere in this thread up there

[RO-G]

All within the City, but roughly 70% Highway:30% City (cruising at 85 km/h - 1600RPM - cruise control)

No wonder you're getting good mileage out of your Rogue.

[philipa_240sx]

I get similar mileage as ahhbeebee for the same reasons. I drive 70% rural/country roads at 95km/h (57mph). I routinely get 30+ mpg during the summer.

If I keep my highway speeds under 110km/h (65mph), it's only slightly lower... maybe 29-30mpg.

[Pescakl1]

I already fill my tank with a little bit more than 68 liters (about 17.9 gallons), but I usually try to fill it until I see the fuel (not wise I know).

So you can say that the tank is at least 17 gallons.

With the squares, when you only have two left (the tank light should just have been on at that time), you have about two gallons left in the tank, about 100kms (60 miles).When the last square disappears, you are on fumes (less than 10 miles to go).

I don't know the computer as I don't have it on my car, but this kind of thing are known as quite inaccurate. You should base your estimate on your mileage, that is the most precise way to know, with a look on the gauge and your computer.

Even the scangauge I got could give me false confidence and I should take its figures with caution.

Right now, I am aiming to get 900kms on the current tank, I will tell you if I succeed at the end of next week.

OK, done!

922.5 kms with only 66.619 l of fuel (meaning I had still at least one liter of fuel left, in fact I still had one square on the fuel gauge).

So that makes 7.22 LHK or 32.57 mpg.

The Rogue has 31.700 kms and runs as smooth as possible.

In fact, that could have been even better as I usually do my morning commute at about 6.8-6.9LHK and it should be the worse of the two if you look at the topography.On my return to home, I am usually at about 6.5-6.6 LHK before I hit traffic jam for the last 30 min of my 1 hour commute. At the end, I have between 7.5 and up to 8.5 LHK if someone is stuck on the bridge or if there is a car accident.

For now, the car will use about 0 liter as I am back to public transportation and then holidays for the month of June, don't know yet for July (hopefully a not too far affectation). Even if I love driving the Rogue, I am tired of traffic jams and long commutes.

Who want to try 950kms on a tank? Any volunteer ?

[lou from ny]

eltondon't feel bad, for my first fill up, i added 14.606 gallons and drove a total of only 161 miles. after some third grade math i find i'm only getting 11.02 MPG. that's just horrible!!!

i realize it's a new engine and must break in. i realize that's almost totally city driving on short trips, but OMG....that's NOWHERE near the advertised 22mpg city.

is there anything i can do to check why it's that low? could something be defective in the engine or maybe bring it back to nissan service for some sort of check?thanks.lou

[Pescakl1]

Lou, I have a bad news for you: you will never be able to do as good as me... in any car you will have (except maybe a prius or an all-electric plug-in car).

100% city driving kills fuel mileage, and short city driving is the worse.Car doesn't have time to warm up and it use more fuel to warm up the engine and avoid stalling.

Try to be as gentle as possible on the gas pedal (even if I know it is not the easiest thing to do in NY). If you do only city driving, you should never go above 2000 rpm. At green light, take about 1500 to 1700 rpm at first and when the converter locks, ease the pedal to about 1300 rpm, you will see that the car still accelerate quite efficiently.Last thing, try to anticipate red lights and traffic and ease as soon as you see that it will slow down soon.

[lou from ny]

sounds like the guy in driving school all over again...lol

i'm not trying to set efficiency records, just see if anything is wrong or if the stated claims are false, but thanks for the tips anyway lou

[philipa_240sx]

Give your Rogue about 3000mi to break in. Fuel economy should start improving once everything is 'broken-in'.

BTW, The constant acceleration of city driving is actually good for engine break-in. But try to drive more than 20min at time so the engine has a chance to warm up... even if it means taking a different route. 5-10min trips is probably the worst thing you can do a motor... wear and longevity wise.

[Pescakl1]

sounds like the guy in driving school all over again...lol

Sorry if I sound like one of your old driving school teacher, professional deviance I believe or remanescence of my french arrogance .

i'm not trying to set efficiency records, just see if anything is wrong or if the stated claims are false, but thanks for the tips anyway lou

Like Philip said, give the car a chance to prove you what it can do with more mileage on the car and more time driving when warmed up.

[hjsbrocco]

Ok so I just got my Nissan Rogue sl awd about 10 days ago and I've put on about 250 miles combined City/Highway driving an I'm getting 16mpg...ughhh...I call the dealer got a tech who said I need to wait for a break in period of about 6,000 miles...She said the mpg could fluctuate anywhere from 20 to 30 mpg. When i told her I was only getting between 15 -16 mpg she said to wait the break in period. Been reading the post about rpm's and will check to see if I rev to hi or whatever. I am dissapointed so far with the mpg. Most of the trip I took yesterday was at a steady 60 mph without any stopping for about twenty min and still only got 16.2 mpg

[philipa_240sx]

Please be patient. The first couple of tankfuls will be the worst. I got less than 20mpg on my first tank as well. Fuel economy gradually increased to nearly 30mpg (mostly highway @ 60mph) once I broke 5000mi.

This is completely normal and has been characteristic of Nissan's. My '03 Altima had similar poor fuel economy for the first few tankfuls.

[RO-G]

I thought the break in period was 2,000km only as per Owner's manual.

[philipa_240sx]

I thought the break in period was 2,000km only as per Owner's manual.

The 1200mi. (2000km) is just the break-in schedule. Afterwards you are permitted to drive normally. However, the overall engine/transmission break-in period can take 5000mi or more.

There are a couple of reasons for this:

1) Modern Nissan engines use hard chrome faced piston rings which are slow wearing and take a longer period of time to break-in.

2) Some have suggested (although I have never confirmed this) that the ECU may have a special 'break-in' program. During break-in, the engine may run more rich and/or retarded ignition timing to 'protect' the motor which decreases fuel economy.

Regardless, I have owned 2 Nissan's with the QR25DE motor (Altima and Rogue). Both of them did not get achieve their maxiumum fuel economy until +5000mi.

[hjsbrocco]

I check with a friend who also has the exact same Nissan as i do and at 500 miles he's getting around 20 mpg I'm at 300 and in the city so far the best I can get is 10.3 mpg so I'll keep checking it. I mean 10 mpg is awlful....The duce and a half I drove in the army got better mileage...lol

[gjp0928]

I am the original owner of a 2008 SL/AWD with 22,688 miles on it. When I saw the note about the on board computer (OBC) not being very accurate I was curious because it has been showing 26.1 mpg for the better part of six months, ie. I have not reset it for over six months. I just ran a manual check on one tank refill and I got 26.2 mpg. My driving is a fairly even mix of city, city freeways (at rush hour), and country rural 2 lane roads. I have not yet taken any open interstate highway trips so I don't know what type of mileage I would get there. I guess I would have to say that the OBC in my car is fairly accurate given the fact that it does not get an accurate metering of gallons input.

[mx6bfast]

Mine can be all over the place. This last tank the computer showed 26.3 and I got 26.4. But others have been way off. 26.1 comp, 28.1 calc; 26.3 comp, 24.1 calc.

[gjp0928]

I think what I need to do is reset the computer with each tank fill up and check it against the manual calculation for that tank full. I will do that for the next few refills and post my results. I don't know the algorithm that the computer runs but I suspect that as it continually resolves that algorithm, without a reset, it will eventually lock on a value at one decimal resolution which in my case is 26.1.

[philipa_240sx]

Latest Mileage:

8.4l/100km or 27.7mpg. Mostly highway at +70mph (116km/h). I have 35000mi (58,000km) on the odometer.

[gebenhoeh]

Happy camper! Picked up my Rogue in Minneapolis and drove back to Charlevoix, MI. Have the AWD SL. Did not have a clue about the trip computer and average MPG. Used my GPS for miles traveled. Got 30.5 mpg, mostly on hwy at 60 mph with cruse, made the purchase worth while and me a hero with my wife. You have to remember to reset the mpg on the trip computer and I would not trust it.

[ahhbeebee]

This is how impressive the Rogue is...

I just got back from a trip where I rented a 4-door Hyundai Accent, over 3 days of driving mostly highway miles, it was only giving me about 30 mpg. I could beat that in my Rogue with my eyes closed.

Since we are now officially warm and summer (and some of you to the South have had warm weather for some time) - I'm curious.

For those using A/C almost 100% of the time, what is the difference you see in your mileage with and without A/C? I use it too sporadically to get any reliable numbers to compare.

[mx6bfast]

Since we are now officially warm and summer (and some of you to the South have had warm weather for some time) - I'm curious.

For those using A/C almost 100% of the time, what is the difference you see in your mileage with and without A/C? I use it too sporadically to get any reliable numbers to compare.

The last 3 tanks I've gotten between 26 and 27.5 mpg with the ac sporadically. However this tank, since last Wednesday, I have run the ac probably 97% of the time. So far the computer shows 24.2, when it would usually show 26+ at this stage of amount of fuel used. I'm just under halfway thru the tank but I will post my final numbers.

btw when I started my car yesterday, the temp on the computer read 106. Ugh!

I'm in Bartlett, TN, suburb of Memphis.