I am consistently getting 330-340 miles per 10 gallons. All of this is city driving. I also wrok nights and hardly ever use the AC. Plus I have a RMR air intake..

 

would an intake really help fuel economy? what about exhaust/headers? i can figure out if this would help or hurt fuel economy......

 

Intakes may improve it slightly. Header and other exhaust components are post burn. They shouldn't change a thing. Anything that affects the air/fuel ratio could change your mileage however.

 

Efficiencies gained in the exhaust system can affect fuel economy in a positive fashion. Most stock exhaust systems don't efficiently empty the combustion chamber of spent gasses on the exhaust stroke, especially as rpms increase since backpressure increases. A situation develops where on the next intake stroke you mix the incoming a/f mixture with leftover combustion product from the last power stroke, decreasing overall efficiency.

In addition, the higher the backpressure, a higher % of energy produced on the crank from cyl(s) on the power stroke is consumed by cyl(s) on the exhaust stroke vs having that wasted energy make it to where you really want it -> the transmission.

I don't think we're talking huge numbers here, but then again not so small that you wouldn't notice the difference. My 4Runner had a high performance Toyota header accessory option (TRD) and I remember the pamphlet touting higher fuel economy as one of the benefits. I think it claimed around a 10% fuel economy increase.

 

yeah...i mean it makes sense, but i don't have enough knowledge to just assume that it does help. but your points seem valid. i would think that anywhere that you can improve the efficiency of your car would help fuel economy in some manner....

 

1.29

 

about 22mpg-25mpg...i drive in city a lot..and i use chevon Premium maybe i dirve my car too hard...i think im gonna try to feed my lancer w/ regular..and i wanna see if i can feel the difference

 

I know I'm a little last on posting, but I have a 03' and I get about 26-27 MPG city/highway. I went on a road trip and found myself at 30MPG max. If you look at the specs on the 02 and 03 fuel economy...they are different. Not really sure why though.

 

by the way...I also have an auto.

 

i get about 13 mpg when i drive under boost and get about 20 mpg without boost. and use sunoco ultra 94 octain. $1.67. NJ

 

My car on average will get at least 350 miles on about 11 gallons of regular gas ($1.31). Most of my mileage is highway miles while I'm commuting from campus to work to home and there's no need for A/C in Washington.

::edit:: Forgot to mention that's Chevron gas I'm drinking and an auto tranny.

 

i get about 330 miles to the tank and just bought gas at a whopping $1.53 at the Chevron. I do both city and Hwy. AT

 

hey ghostider, even when i only drive on the hwy i dont get that kinda mileage. You drivin' at grandma speeds? (me: 70mph with no a/c )

 

Nah, speed limit's 60 and I'm going at least 70.

 

No actually I agree with GhostRider. I get any where between 350 and 400 miles per tank, and I am by no means driving grandma speeds. I would say my average is mid-70's but lately I have been driving 80+mph.