Quote:
Originally Posted by mwebb
the "gains" will be measured in negative Numbers.
and
do not forget to recalibrate your speedometer / Odometer against a GPS for speed and against highway mile markers for distance
use the recalibration for calculating FE per tank
it (FE) will get worse
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Actually, the two tires are almost exactly the same diameter.
OP, you
may gain a little mpg due to the lower aerodynamic drag of the thinner (155) tire. There also
may be a benefit if the new tire has a higher max pressure (i.e. 51 psi vs. 44 psi), resulting in lower rolling resistance.
Make sure the new wheels will clear the brake calipers.