[hat_man]

I just bought new LRR tires that should last quite a few years even with the mileage I drive. I thought I had read here at EM that the rotational mass didn't make too much difference at speed. It made a bigger difference in stop and go driving. I spend quite a bit more time at highway speeds than not, so I thought the taller gearing advantage was a more useful option.

My idea was to try and mechanically create a secondary overdrive situation. I seem to get better mileage at around 2100-2200 rpm, so if I could find taller rear gears that would put me in that range at 55 mph in 4th gear and the same range st 65-70 mph in 5th gear it would cover about 90% of all my driving. I can now do the math and try and make a better decision.