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extremely common quest. to find the best is the past. Fuel injected? 40mpg in a cavalier seems unbelievable. maybe there was gas vapors in the air that day..
to target an engine
1. least friction, maintaining strength. As less friction allows the engine to try harder anyway.
2. 2 liters and up has limitations. 40mpg is outstanding.
3. inline fours are not the best. 40mpg is outstanding for a regular car like cavalier size (reality sized if you know what I mean)
4. highway capable, at least 80mph casual. this requires weight and more than 2500 pounds (there are big breezes out there)
Upon 20 years of driving, I went all the way back to my first..a 3 main boxered subaru. the air cooled beetles, even lacking benefits of some physics with liquid cool, still has a 65mpg version.
the engine as the best is a 3 main boxer four,
it can withstand a heavier vehicle for reality, and go hypermile easily...for a loong looong time.
I have had the others over the years. transverse drivetrain are no longer a part of my life (never again). I had a chevette, and well, the inline has flaws, not just chevette. I concluded it does not matter how the inline is mounted...the thoughts of the best of the best is not going to happen with one. hope I helped. What you want is extinct. Find a keeper.
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