The best I have seen with mine is 30 mpg on the highway at a steady 75 mph but....
My average is always around 15 mpg because it is in warm up mode 90% of the time.
I filled up the other day in town after the car was warm, reset the DIC average mileage, then drove home and averaged 27 mpg at a steady 40 mph pace.
Sure doesn't take long for that average to drop if you idle at a stop light then floor it when the light changes.
Thats why everyone says L67'* have a 40mph lag. But if you get a reprogrammed computer your 1st gear downshift will come at 40mph or sometimes even up to 45mph.
I agree with that one. I was surprised when I first got the Bonne that it wouldn't kick down into 1st gear for that rush of power like I'm used to getting with both my Jeep and Firebird. The Jeep will spin the tires on a wet road when it kicks down into 1st gear doing 35 mph (in 2 wheel drive). The Bonne seems to bog at 40 when I kick it down.
That ASEchips.com upgrade is sounding better all the time.