Quote:
Originally Posted by roosterk0031
Normal driving is very hard to define. In the US I speculate most 3 cyl turbos (Fords) are running with boost most of the time a 3000+ rpm. Under boost means rich = bad mpg = bad emmisions. A 2.0 NA can do better under what I consider normal US driving conditions because it stays closed loop.
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For example 3 cylinder VW Golf runs 85-90 mph @ 3000 rpm. Is this the speed you drive most of the time? What 2.0 NA would be more fuel efficient than this VW engine? A modern 3 cylinder with integrated exhaust manifold is not going to need rich mixture too often.