My wife's G6, gets 38 mpg on a 70 mph highway trip, and averages 29.7 for a 25000 mile average for 4 consecutive seasons! That Town car only gets 21 on a casual highway run, and compared to that Pontiac, can't get out of its own way! I know, we had one!
Good for a geto cruiser, but even my 2006 with the Z71 off road pkg, 4x4, and locking rear diff, with heavy payload and towing package, extended cab, with the high torque L33 5.3 special order engine, only available in 06 and 07 in those 1/2 ton 4x4 ext cab trucks, by special order, with 10 to 1 compression and LS6 Cathedral port Corvete Heads, gets 21 to 22 highway, but on a 14000 mile average gets 17.5 mpg. And with only tires brakes and oil changes, besides its 100,000 mile tune up (spark plugs and all fluids changed) has never had a wrench on it. Makes it as cheap to operate than my old Town Car with that underpowered 4.6 gas mixer engine, and does have considerably more power.
The G6 with over 160,000 miles and on its 3rd set of tires, 3rd battery, and one tuneup at 100,000 miles, that gets an oil change once a year, every fall, Amzoil Premium 5w30 for total maintenance would be cheaper hands down!
My response is; Correct spelling is 'getto'~! On the highway during long trips my TC gets 25.8 mpg, and the comfort level is unsurpassed. It's no "drag car", and I haven't had a ticket on over 24 years. Your hot rod G6 was mostly purchased be the 'go fast guys' so when buying a used one you can't ever know how it was treated during its former ownership.