that is HORRID gas mileage...
whats the hp rating on the gto? 300hp?
i dont have a 300hp car to compare with, but my 240hp accord that weighs 3200+ lbs gets 34mpg cruising 300 miles on the highway going a little over the speed limit.
I know that you're fanatical and that this won't help at all, but here goes.
My GTO has 400hp/395tq, and weighs in around 3800lbs. You don't buy this car for the gas mileage, you buy it for the experience. My garage has two cars over 400hp sitting in it, and I daily drive my GTO.
I spend under $90/month on gas as my daily commute isn't terrible. I do pay around $1900/yr for insurance on both of my cars combined, with full coverage on each though.
I'm also under 25, so that doesn't help despite a clean record.
Once you do complete your research you will find that it's going to be very difficult for you to come up with more efficient hp to mpg cars than the ones powered by the LSx series of motors.
The GTO has 66.5% more power while being 20% heavier, and with the major downside of only being 45% less fuel efficient than the Honda you're yapping about.