Wait a tick... I just saw a 2000 Honda Insight in the top 10 gas only cars category... #7... Who's is it? *Click* HEY IT'S MINE! lol.
I'm a hybrid. Not sure how I got in there, but it's definitely cheating.
I found that when I edit my car, I left it on "gas" as the fuel instead of "gas/electric hybrid". So I think your answer is to change to gas instead!