The Pontiac G8's gas mileage varies depending on the model and engine variant. Here are the EPA-estimated city and highway fuel economy figures for the different 2008-2009 Pontiac G8 models:
G8 GT, Base V8 engine (5.3L):
- City: 15 miles per gallon (mpg)
- Highway: 25 mpg
G8 GT Performance & GXP models (6.0L):
- City: 14 mpg
- Highway: 19 mpg
