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<p><i>"Increasing total wheel/tire circumference WILL increase
MPG... More road covered for each explosion!"</i></p>
<p>"C<i>hanging rear wheels for a road trip is easier than changing
the trans or rear end gears</i>!"</p>
<p>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.</p>
<p> 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.<br>
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