HCH1's LB doesn't suck as much power for some reason, maybe it doesn't lean out as much? Idk. I just remember driving a HCH1 at one point and it was very difficult to tell that I was in LB at all. MPG's don't jump up as much, nor does the power dropoff feel the same.
50mpg @ 70mph should be achievable in an HCH1 with LRR tires and proper foot control.
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