is it normal for my 91 miata reads 3900 rpms going 70mph? It is pretty close, but doing the math.... 3900 rpms 5th gear .814 diff gear 4.3 tire rpm = 1114 stock 91 tire size is 185/60-14 circumference
...more than 10 % between cylinders" is good enough for people who are not interested in doing the
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