have a new ss. anyone have any input on a power programmer? looks like diablo is the only one that has one for the car? the car doesnt really need more power but it would be nice to tune the trans. also-the car seems to be getting only 11 miles to the gallon. it only has 250 miles on it but idsure like 16 or 17. its hard to keep your foot out of it. ive had z28 and z06 and they were fast, but this thing is fast and smooth.

 

The part of your post that I highlighted red is the reason for your poor mileage. Ya wanna do better, you have to drive with the express purpose of achieving good mileage.

I test drove an Impala SS while my Aveo was having some warrany work done. It's an awesome car no doubt. When I put the DIC on the fuel economy screen, where it also shows whether you are in 4 or 8 cyl mode, I found it quite easy to get the car in 4 cyl mode and keep it there. In so doing, I was seeing some numbers well in excess of 40 mpg. I've had a Prius and Ford Escape Hybrid in the past, so I do have experience in driving for economy.