I've been involved with Honda automobiles for a good 10years. I have gone through 5 models. I've just recently or about a year and half ago finally broke down and bought an 1990 Acura Integra LS (Auto). Now I don't believe in modifying the car to where it becomes illegal to drive on city streets. What I have learned though is that Honda motors are at the least the most intelligently developed engines in the world (again this my opinion...I'm sure those of you who are reading have a different angle on this...) They take the least amount of fuel and bring about the most amount of HP to bring about a great deal of FE. I've also learned that if your the only person driving the car is to make the car as light as possible. I'm not talking removing stuff from your trunk I'm talking. removing material from the inside. When you think about it the interior adds further weight. So at the very least removing the rear seat and trunk panels including the carpet would help in saving weight of 20-60#'s. I've even considered purchasing a Carbon Fiber Hood and Trunk. The stock hood for my car car is approx 80#'s and about the same for the trunk so that's nearly 200# is weight saving increasing the FE a great deal. However, this modificaition comes at a cost ($400-500 for the hood and $600-800 for the trunk. If lucky, can even find Carbon fiber front fenders). Now I don't like fancy looking hoods and gills so I'd stick with the stock look. Then there's the Wheels. Honda Civic hatch back wheels such as the HX (96-97) all have a light alloy wheel that weighs in approx 11.75# each. getting your engine to turn these wheels should also add to fuel savings as there is less mass to torque. However, these wheels are only 14" but if you increase the size say to 16" and finding a forged wheel that weighs in at 13-15# your increasing FE and decreasing rolling diameter (remember this is the wheel only, you have to account for tire weight). So for those of you who have bigger wheels, with chromed feature. Try removing that wheel and putting it on a scale. If you have a wheel that weighs in at 30-40# especially when your using the stock steel wheel, the operative word here is STEEL then your definitely making your engine work harder.