Will you let us in on why you want to reduce the fuel tank size rather than just put less fuel in?
An 88-91 Honda Civic had an 11.9 gallon fuel tank, which is pretty small. Lets say you cut the fuel capacity in half, you'd only reduce weight by 37 pounds, and your range would be somewhere around 180 miles.
Reducing weight is great for racing, but has very little benefit to reducing fuel consumption.
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