Tire size affecting mpg.???
Recently replaced OEM tires with new Continental CrossContact LX2's on recommendation from my shop guy (independent, NOT dealer...but very good.)
Moved up in size from 265/50/R20 to 275/55/R20 on his recommendation.
Have noticed a considerable drop in MPG.....from 20-21mpg highway to barely 16 mpg. Also noticed on long recent highway trip (1600mi) that my MDS very seldom engaged, even on flat terrain.
Have not yet been to dealer to have him check it out BUT could this change in tire size affected.???
Vehicle is 2011 GC Overland Summit 5.7L, 55k, purchased new and very well maintained.