I have a G8 V6 (2009). Average 24.7 mpg with about 50% highway miles. I've seen 28 mpg on a long drive at 75 mph, and over 30 on 55 mph roads. Never less than 20 in town. Bought it instead of the V8 because I needed a car and the price was right. Couldn't find a V8 car at the time without tons of options, so the price difference was more substantial that it should have been. I love the car, and so does the wife. Handles great, rides smooth and quiet, can carry 5 adults. I can spend all day in it and not get tired of driving. Sure, it would be more fun with the V8, but then I wouldn't be able to keep my foot out of it and would probably just burn more gas & tires. That's what the '66 GTO is for.
I don't think anyone could financially justify swapping a V8 into a V6 car. It would be much cheaper (and no swap work) to just sell it and buy a V8 car instead.
John
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