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O.K.- I'll drive slower, I promise!
Stock '06 XRS numbers:
6th gear 0.725
Final Drive 4.529
195-55-16 Michelin Primacy
In addition to driving slower, it appears the simplest thing to do to improve mpg is to swap to taller tires. I already have 205-55-16 Kumho Ecsta SPT's. This dropped my rpm's by 47rpm at 60mph and 55rpm at 70mph. However, I have no idea how the Kumho's compare to stock in terms of RR. Yes they are slightly wider and heavier- but they have a harder compound than stock. Anyone know?
I want the lowest possible RR tires I can fit on 16" rims.
Option 1:
Go to 195-60-16's, hwy rpms compared to stock drop by:
82rpm at 60mph
97rpm at 70mph
Con's: only a handful of manufacturers make this size.
Option 2:
Go to 205-60-16's, my hwy rpms compared to stock drop by:
131rpm at 60mph
153rpm at 70mph
Pro's: bigger drop in rpm's (numerical equivalent to changing the FD to a 4.31!) and there seem to be more tire options in this size.
Con's: the entire driving rpm range is affected- seeing the 2zz enginehas low torque to begin with...
I am leaning towards 195-60-16's, but I can't seem to find RR info on current tires.
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