could the MAF sensor possibly be damaged? I have read that an over oiled K&N air filter can damage the sensor if any oil gets on it.

 

It's your exhaust. 3" is waaay to big for this motor (hell, its almost too big for my truck's V8 ). You're making the engine work harder to push the exhaust out and you've lost the "scavenging" effect that you get from a properly sized exhaust. Scavenging is where the spent gases are sucked out of the cylinder, allowing more fresh air to mix with your fuel. I'll guess you're feeling down on power, too?

Additionally, the 18's are gonna create a lot of extra rolling resistance which makes your engine work harder- so that will lead to lower mileage, too.

Stick with the regular octane gas (search for my name and octane- I'm too lazy to rehash the arguments yet again).

 

im thinking your problem is your 3' Exhaust

 

My guess It's your 18's dude.... I"m having the same problem.

I got about 160 miles to the tank. I'm already on "E" with the light on and it's just about time to refill.

All I have in the car is a Intake and Greddy Exhaust 2.25. I'm running 93 octane as well.

It's time for my Timing belt to be replaced and I have the PB and Pulley pending for installation.

 

If you want better MPG, go back to stock. You picked horrible mods for gas mileage. You have huge rims, a poorly-sized catback, etc.

And run 87 from now on. Stop wasting money on premium.

 

DJ always knows how to synthesize the argument into the fewest words possible But what he -meant- to say was "quit wasting my octane enhancing chemicals!"

 

well it hasnt been said so uh.... Its your body kit, lose the body kit

all jokes aside, your exaust doesnt make sense and you have no back pressure, where ever you got the exhaust from they f'd you over pretty bad

and your 18's are harder to turn, and judging by the fact that you actually went out and bought 18's, AND a body kit odds are you got some heavy *** no name rims

 

you guys are all wrong!!

the lack of speed holes in the body kit is affecting the MPG ...

!!!!



edit: dj was accurate ..

edit2: incase anyone didnt get it, i am playing around

 

my rims are light there alloy racing rims

 

Get some Sea-Foam...

 

OK, it's now a dogpile. Let's close.

hearttaker84 - you know what to do.

 

I've noticed the same problem with my '03 Lancer. The best mileage I ever got out of it (pure stock) was a couple months after I first got it, I pulled off just over 36mpg on an all-highway stretch between MA and ME, since then I average 33-34mpg highway. As of late though I've been lucky to hover around 30mpg if that, I get a little over 300 miles a tank at best.

Changed the plugs and filter recently, never heard of this sea foam stuff 'til now, I may have to look into that. Also seem to be having problems with the fuel pump now too (car will hesitate pretty reliably if I'm too sharp on the gas pedal) so that may not be helping things either.

 

I have no idea? I driver hard most of the time and get damn near 300 MPG?

 

hrm maybe gasoline products, however regulated are getting crappier? I was told by a mobile owner a long time ago that the higher price consumers pay for gasoline, the less profit she would make off each gallon. Then there's the Russian crime oil and gas. Maybe more of it is mixed with who knows what? Just kidding... but it could happen. I can fill my tank (05es) and 250 sounds right = 2.5 days of work

 

I rarely get to make long trips and Seattle traffic is all stop and go. I ususally get 24.5MPG regardless of how I drive unless I fill up before the gas gauge gets below half. Then I'll get closer to 30. I take the miles on the trip odometer and divide by the gallons on the pump. Miles/gallons = MPG

Sometimes I get closer to 39MPG- that's 90 miles to the track, a day of autocross, back home with a fill up about 3 blocks from the house.

Try changing gas brands (I believe mentioned above). don't use cheap gas- it has less of the detergents that keep your fuel system clean. I race on Shell but have been putting Chevron and 76 in the tanks just to get different additives. Don't go above 87 octane unless you have a -good- reason (turbo, radically changed timing and fuel management, etc); the unburnt hydrocarbons buildup in your cylinders, on your valves (so you can't get a good seal between the valve and head) and can foul your injectors.

Engine load also contributes- by yourself is a different load for the vehicle than, say, you, your wife, kid and camping stuff in the trunk- that's a lot of "extra" weight. Ambient heat makes the engine work harder and there's less oxygen per volume at 90deg than at 30deg. Fuel at the pump expands from heat so you're getting less at the pump if you're filling at noon than you would at 10pm, for example.