Not sure what you're trying to do...but,
I'm not sure if you remember my little red Honda CRX, but that car got 50-55 miles per gallon. I used to shoehorn-park it in every little space I could when people took all the "real" parking spaces outside of VFA-41's hangar. That car was great, but I had to leave it in California. I couldn't deal with going back to a car that got less than 40MPG, so I bought another CRX HF when I got back to the east coast. These CRX HF's are ridiculous with the gas mileage.
Not sure what you're currently driving, Dan, but hopefully you can get some good info from this site.