Originally Posted by Alan'* 05 gxp
I have an 05 GXP with about 8k miles on it. I drive about 75 miles round trip to work (mostly interstate) and average about 18.6-19.5 mpg. Couple of short highway trips showed about 21-22mpg taking it easy (60-65mph)...
I've only got about 1000 miles on mine, but I'm seeing about the same on a 60 mile round trip commute. I'll have to double check, but at 75mph, it'* running 2300rpms(?). That'* pretty high for a V8. I think the mileage could have really been helped by an extra gear.