the thing that pisses me off about my car. is before the rebuild *we all know my story about the 30k miles on the motor and i blew it up* anyways before the rebuild i was getting 14mpg and yes i was pushing the car. and now after a freshly rebuilt motor my car isnt even getting 10mpg.

 

I drive a local canyon once in a while. I'd estimate it to be around 5 miles one way. When I drive down the canyon and back up, I can go through about a quarter tank according to my gas gauge, depending how much of the time I'm in boost. So if a quarter tank is 5 gallons, and that's gone from about 10 miles, that's 2mpg from my calculation.

 

And to think that I get 27MPG Highway running around 85MPH the entire way


Not sure about city, but that 27 was calculated twice. Once from home to DGRR and again from DGRR back home.

..Thanks Steve Kan!!!

P.S. That is NOT including mpg while AT the dragon... I didn't have the stomach to calculate that...

 

I got 15.2mpg with a fairly heavy lead foot and 90% city driving last tank.

While driving 1100 miles home with the car, I got 21-22mpg, which isnt too bad.

 

wait a week and the 7 will break and=high gas milage. For 2 year I NEVER filled the tank.

 

i drive only city and my FD is Stock nothing done to it but stilll wat rpm should i change my gears at maybe that the problem???

 

I daily drive my FD 100% in the city, I drive competely off boost at all times, changing gears at about 2500rpm - 3000rpm and gas milage is still pretty poor lol. Its not good to consistantly drive it off boost so I take it out and do some high speed runs every now and again... FD's are not good as gas, but we don't buy them for that... their awesome cars to drive <<< thats an understatement.

 

hahahaha

 

Then what you are seeing is about right for your driving and your setup. You might be able to pick up a little extra by normal maintenance:

1. Fuel filter (if it hasn't been changed in a while)
2. Spark plugs
3. O2 sensor
4. Run a lighter oil like 10w30

Running a heavier oil when its not needed will also reduce your gas mileage.

 

dont flame me but i saw this video of a guy who put pure acetone in his fuel ( i believe it was like 1/10 a gallon or something...and he picked up 10MPG..but that was a piston engine, i dont know if the same principles would apply.

 

Why even own an FD then??? When I daily drove mine, I certainly didn't drive it like that. It makes little difference in gas mileage between granny driving it like that and having a little fun on the commute. And all that granny driving will just carbon up the motor -- solution, do more high speed runs and less granny driving.

 

Good suggestions. To that list I'd add tire pressure. At least 32 psi all around.
(Go too high though and you'll see accelerated tire wear in the center of your tires.)

With stations charging .75 cents for air these days it can be a disincentive to keep your pressures up. But just naturally, most tires will lose about a pound of pressure every 1 to 2 months.

 

That isnt going to be very accurate. it will give you a rough idea (which is probably good enough at 2 mpg )

I had records of my fuel economy on my motorcycle and my truck (until I moved) and the best way to get accurate accounts of your mpg average is this:

EACH time you fill up:
mark down the mileage on your trip meter.
mark down how many gallons you put into your tank
reset your trip meter.
use the math of miles/gallons=mpg

I could send you the spreadsheet I used, It was kinda fun, but kinda tedious at times. So I started writing the trip mileage on the gas receipt each time and tossing it in the binder with the fuel records. then updating it once a month or so. If you do this consistently, you will get a VERY accurate idea of your fuel economy.

Variables to eliminate: Try to use the same fuel pump as often as possible. this will ensure that the sensor that stops the fuel flow in your tank will be clicking off at a consistent time. DO NOT TOP OF YOUR TANK. this will give you mixed results since it will now take 2 tanks worth of mileage to get accurate numbers for those tanks. But it wont make a difference over a long period of time... since you will still be accounting for each gallon of fuel put into your car.

 

For some reason, I get worse gas mielage on the freeway then streets. I keep off boost too. I dunno.

 

From a govt. website:


"You can improve your gas mileage by around 3.3 percent by keeping your tires inflated to the proper pressure. Under-inflated tires can lower gas mileage by 0.4 percent for every 1 psi drop in pressure of all four tires."

http://www.fueleconomy.gov/feg/maintain.shtml


My guess is that pumping an extra 3 - 5 pounds of air into the tires of your FD won't provide the improvement you might see on some other cars. The FD seems to have a naturally low rolling resistance. It coasts farther than any I've ever owned. Still, it might help some.

 

Some guy at Clubrsx i think did a full writeup about getting better gas mileage. Changed everything and then put pure acetone in. Acetone made the biggest difference. Dont try it on rotaries

 

From what i remember reading, good injectors, a good intake, and a good tune with the PFC are what really help you brink up those MPG numbers.

 

Dont boost..

 

If I didn't want to boost,i'd get a Honda