1.6 from an early Miata? Parts availability is very good, especially weight-reducing and performance enhancing mods if you want more than the original 115 horsepower. Online community is very helpful as well.
The NA Miata, with a .38 Cd, was rated at 30 highway (old number), so it seems like the potential is there for some very good mileage, especially in a light car with a higher-geared differential &/or bigger diameter tires.
1.8 from the NB Miata makes ~140hp stock, returned the same mileage rating.
The Miata transmission is a real sweetie as well, short throws & good feel. 6-speed is available on the some of the later ones.
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