Gas mileage

thanks everyone..

Out on the road, cruise set at 70MPH I get between 30-32 MPG instant, and about 27 MPG average.  In the city, the average drops down to 21 MPG, but then I like to floor it as soon as a light turns green, and accelerate to the posted speed limit for that road.

Hi, anthonym2010-04-17 06:39:20

Anthony:  Miles should not be a factor.  My '07 has 25,000 and is now getting the best mileage per gallon ever.  What does your onboard computer show when you are driving, such as the instant fuel economy?  What engine and transmission do you have, and how do you normally drive it?  I have the regular 6.0 liter 400 hp engine with an automatic 6 speed paddle shifter.  I have modified the exhaust (Magnaflows) and have a BBK cold air intake.  I have not changed the air mass meter.  As I said, in the city I get about 18 to 20 mph, but a good 30 to 32 on the open road.  The best setting I have found is cruise control set at 70 in the open highway.

Well it looks like we all have about the same mpg. I also get  about 30-32 at 70mph on highway and have gotten as good as 21.5mpg in town,(not very often).

I have a 2007 Z51 with automatic. K&N cold air kit and throttle body spacer are my old real mods here. Always 22-23 MPG in the city and 31-33 MPG highway (regular gas, no premium here)

I run Royal Purple synthetic oil always, which I know really helps but I truly believe that the K&N cold air kit with the throttle body spacer are helping it breathe here. Remember that an engine is nothing more that an a big air pump, so if you can make it better to inhale and exhale, you are making it more efficient.

CPAL1843.

CPAL1843,

Best prices were both on Amazon.com, believe it or not!

Throttle Body Spacer is $59.00 (free shipping) - http://www.amazon.com/2005-2007-Corvette-LS-2-Throttle-Spacer/dp/B000JLGFFY/ref=sr_1_1?ie=UTF8&s=automotive&qid=1272396633&sr=1-1

I drive an 08 Atomic Orange Metallic coupe, totally stock, about 25000 miles on it.  It is a daily driver, plus some autocross and drag racing.  I get 19 in town, 29 to 30 on freeway trips.  This is based on ACTUAL MEASUREMENT and calculation, and NOT on the dash display.  The calculation in dash display always measures higher than it really is, by 1 to 2 mpg.  This was also true with my C4 and C5.  I'm not sure whether it is set this way to make you think it is better than it really is, or whether it has something to do with the way the fuel metering gauges work.