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that was a obvious result. the wieght of the rim also added to the less mpg.
the REAL question is at what point is a TALLER (regardless of width) not effective.
It's all about lowering the rpm at cruse (60mph)
I run a 255x45x18 instead of the factory 245x45x18. it's just over 3% larger diameter.
I have consistantly gotten 27mpgs on road trips w/epa of 23 and averaging over 64mph.
I think that if I could find the 19" factory rims cheep, I would try for a 6% increase over the factory diameter
THe other question to concider is the extra wieght that you are spinning when you upsize. I have been told that spinning mass is actually 4x the static wieght
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