I guess what about having extra pistons makes mpg worse vs. 1.8L, 2.5L, 3.5L, etc.?
In: 168
Smaller pistons = more friction per CC.
Same with any 3d shape.
You also have 50% more con rods, 50% longer crankshaft and cam shafts, 50% more valves, etc.
It’s a lot of extra friction and rotating mass that doesn’t gain you anything.
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