Overdrive or don't worry about it? !

abodyjoe said
26" tire:

3.55 @ 70mph = 3250 RPM
2.94 @ 70mph = 2670 RPM

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28" tire:

3.55 @ 70mph = 3000 RPM
2.94 @ 70mph = 2500 RPM.
Click to expand...

These are spot on. Dad has 3.55 with 275 60 15 on his barracuda. I now have 2.94 with same 275 60 15 on the Demon. Exact numbers we are seeing for 28" tire.