so I am writing to see what how many miles your getting per tank i am only getting about 250 or so and i shift at about 3k rpm. I drive about 80% city and 20% highway. What can i do to get better gas mileage.

 

There's your problem.

I'm averaging 17mpg.

 

Shift at lower RPMS, try to coast to lights/stops more, etc etc.
Do they put ethanol in your gas? I've noticed a significant drop in mpg when I get some gas that has it.
I average about 20 MPG overall, 26MPG highway

 

how do i know if they are putting ethanol in my gas or not i go to shell and get premium so i dont know

 

I do about 90% highway and get 400-440 per tank, but now I did some mods so I'll have to see how much that changes.

 

Most gas stations here use 10% ethanol, but I never see a difference between those and the ones that don't use it.

 

8923748th mileage post - search = fail

I wasn't overly concerned with mileage, so I bought a 290+hp car and drive the **** out of it. My friend had mileage concerns. He bought a civic.

 

+5000

 

Believe it or not... coasting to stoplights uses more gas in a modern car. If you coast to the stoplight in gear with your foot off the gas, you will use no gas.. that's right, absolutely zero gasoline while you're coasting there, provided that your RPM's stay above a certain point and your engine is fully warmed up. If you coast in gear, the ECU cuts fuel from being injected into the motor to increase efficiency. All modern cars operate this way.

 

Clean or replace your air filter, make sure your oil is not super-duper old and cruddy, use quality gas of the right octane rating, try to use cruise control when coasting at constant speeds, keep your tires properly inflated, and make sure your front wheels are properly aligned. If you're driving 80% city, fuel economy is never going to be optimal. How many gallons are you using to fill up when you get your 250 miles out of the tank?

If you tend to fill up when the tanks gets down to 1/3 full(instead of letting it get real low), your fuel economy might not be as bad as you think. Unless you're running your tank from completely full to completely empty for every tank of gas.... It's Miles Per Gallon that matters, not Miles Per Tank.

 

remove all dead weight like floor mats, spare tire, change in the holder, gps disk, a/c and pwer steering belts, passengers. and don't turn on radio. also only fill up to 1/4 tank and drive till empty. if you fill all the way that's an extra 100lbs (aprox 8.5lbs/gal) your lugging around. also if you go on a diet and shed a few lbs that would be good too. buy skinnier tires to minimize rolling resistance - but cornering will suffer.

 

I did not know this but I'm definitely going to try it out!

 

Don't expect to see major gains from it though.... the amount of fuel you use when coasting to a stoplight in neutral is the same amount that you would use to sit there and have your car idling... which is not much. But "not much" is still more than "none".

I think the common misconception that many people have though, is that there is a direct relation to how many RPMs your engine is spinning to fuel useage... when in fact that is not the case. It's more or less the relation of how hard you're pushing on the gas pedal to how fast you're going that determines economy.

 

i usually get 19-20 MPG with mostly city driving, and 25 MPG highway. when cruising i shift at about 2200 RPM.

I average 310-320Miles to the tank w/city driving, and fill up when the gas light goes on.

 

G35 C gets good city mpg. I had a 03 3.2 CL type s and was getting 13-14 mpg city... 3.2 Vtec eats way more of 91-93 octane then the nissan's 3.5.....