best compression ratio street build?

I'm not so sure, I drive a 1992 Olds with the 3.3 v6 with a heavy foot and get 20+ mpg, only burn 93 octane gas since it was brand new-yep, gm did make some good cars back then..had other gm's with 200,000+ miles. Now I can't take off very fast but it gets up to 50 mph ok and even with 165,000 miles can past new Buick SUVs, Ford Focus, etc. I limit my speed on the E ways to like 75 mph max cause its like unsafe in a crash and has 14 inch rubber.

I can NEVER get 20 mpg in my 3.91 gear car with the 340. Now true, I could pass my little "hot rod 3.3 car" without even trying, ha ha.