Quote:
Originally Posted by CargoBoatTails
well I guess we'll never know for sure with the odometer error on different height tires.
|
Odometer error doesn't come into play with the graph CapriRacer posted, since that's done on a bench.
It doesn't come into play with MetroMPG's tests, because those are measured by actual distance travelled measured on the ground, not from the on-board trip meter (if you have a trip meter that can measure in feet... good for you!)
And EPA tests are performed on a rolling road dyno... which means all speed and distance measures are audited by the machine, not the on-board odometer or speedometer.
_
It's simply this: Manufacturers themselves spec taller tires for the "high economy" variants of their cars. As shown by the Fiesta SFE. As shown by the Cruze Eco. They would not do this if those tires hurt economy. That is all.