For those of you out there with most or all of the bolt on's for your car (such as cold air, 160 thermostat, aftermarket MAF, plugs+wires, coil, headers, catback, ect.) also with NO actual motor work (still the stock LT1), what is your average MPG? Specifically looking for M6 MPG.

 

I have everything but the headers w/M6....I average 22mpg combined (and get on it quite a bit) and have had as high as 30.1mpg on the freeway for a 400mi round trip.
I average about 25-26mpg on the freeway @80mph
My new 383 will have headers and the LT4 hotcam kit & I still expect around 20mpg combined

 

20-21 30c/70h. I can't expect much better. My T/A only got 15.

 

14 city
24 highway

 

brad...you get 70mpg onthe freeway?

 

damn, must have fabbed up a "displacement on demand" system for the LT1, kudos

 

No I think he meant that it was 30% in the city and 70% on the highway

 

When my Z was all bolt ons I got 20 city, and 28 hwy. My Formula with pretty much the same set up is getting about 18 city and 25 Highway. I was just curious what everyone else was getting.

My Z with now a 383 still got 23MPG on the highway. I am expecting much less with a newly installed D1SC and a more agressive cam.