People on Miata.net say they get 30mpg with normal driving with the 1.6L. The 1.8 is worse. I get about 26mpg. Main problem with the Miata is the low gearing.
With your home built car, I hope you would use a catalytic converter, otherwise pollution will be much much worse. I believe a small 2 stroke scooter emits something like 10x the pollutants other than CO2 as a car.
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