[Tigers] 15" wheels?

[Tom Witt]

/"Increasing total wheel/tire circumference WILL increase MPG...  More 
road covered for each explosion!"/

"C/hanging rear wheels for a road trip is easier than changing the trans 
or rear end gears/!"

I agree with that with these caveats. The increase comes mostly on level 
or downhill roadways. Inclines can require more throttle than with 
shorter tires and you are back on the other side of the "sweet spot." 
RPM is not the only factor. My daily driver Mazda spins at 3,000 RPM and 
gets near 35 MPG. My Studebaker with a 700R4, 225-60-16 tires and 3:07 
gears spins at 1,600 RPM and gets about 17MPG. both cars at 65 MPH 
freeway speeds. Yea, weight and displacement is a factor but half the 
RPM gets half the mileage.

Taller tires and a Tiger with a close ratio transmission are not a good 
match. Also unless one has a compensated odometer you need to do the 
math to recalculate the actual mileage. A T-5 transmission over a wide 
ratio Toploader will likely see little difference in city driving. If 
you are driving across country for a SUNI or such you may well 
appreciate the investment. But, yes, I'd say a few hundred dollars 
invested in rather taller tires for a lengthy road trip is quite a 
difference over $4,000-$5,000 for T-5 install. The only thing is you 
need to bring your regular tires to swap out once you get there. 
Everything seems to have its tradeoffs. BTW, a 13 gallon tank can also 
be compensated for with a 5 gallon jug - likely the most economical 
solution.

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