Tommyv8

iTrader: (8)

My car has 2.73 gears and the mods in my sig. It's mainly a highway car and I only get about 22 MPG, very consistent. It used to get maybe 1 MPG more before I put headers on it and deleted the cats several years ago; I never had it tuned. So about 23 MPG when it was basically stock. It has 209,500 miles on it now. For the year that I had 3.42 gears it got about 20 MPG. I don't have a lead foot at all and it performs about as well as it should at the track. Nothing else seem awry. I read about guys on here with 2.73-geared autos getting 25+ MPG. Again, the vast majority of the miles are racked up on the highway. What could be going on here?

s25hanh

iTrader: (8)

from what i heard alot of people need a tune after headers, even w/o the header install and tune would benefit the car.

BigBirdLS1

The above poster is correct some people NEED a tune after a header install and cat delete. Though you may not need it your car will definitely benfit from a tune. I can't disagree that your car doesn't drive/perform well as I don't know for sure the integrity and maintenance performed on your car. But with 205k miles is it likely that normal engine wear is taking its toll on your mpg number. I am sure your car performs fine DD'ing and at the track but no matter what there is gonna be wear on an engine with that many miles.

Tommyv8

iTrader: (8)

My car was getting 22-23 MPG (mostly highway) when I first got it in 2003 with 28k on the clock; mileage has not been a factor.