5 MPG increase in Firebird Formula
 

Back in Fanuary I picked up a 1999 Firebird Formula 6 Speed 5.7L.

It has bolt ons and a very very rich tune (Haven't had the chance to get it detuned)

When I started driving it I was getting 15-16 mpg (City driving).

I bought an ultragauge and after getting it calibrated correctly, I'm seeing about 21.5 MPG. I usually average about 23 for most of the tank, but when I hit traffic and, not so smart drivers, it plummets quickly.

Pretty content with that. its become my daily driver as I'm working on my truck.

well frank, its better than... i dunno, but theres something worse im sure

Hey guys 23 mpg out of this kind of car is great, considering what it is. Big overpowered engine, fairly heavy coupe. And made a big % improvement over when he first got it.
Good job Debonair:thumbup:.

Work on the tune, there is another 2 or 3 MPGs easy to get.

ditto.
Smrt move getting a gauge....
did you pump up the tires?? 40+ psi:thumbup:

Old EPA is 19/22/28, which is pretty easy to meet or beat.

not that high I just added about 5 psi

Not around here. Between traffic, people pulling out in front of me to go 5 mph under the speed limit downhill, and people just generally driving like idiots really makes it difficult to hit and stay over 21. Just today i started with 22.8 MPG, near the end of it I was down to 20.9.

Then it appears you are getting the predicted ecocomy.

Of a completely stock car, mine is not stock.

And those estimates are based on 55% city and 45% highway, whereas I'm closer to 80% city.