when i got my 4runner it had 245/75-16 tires i put 265/75's on it on the G.P.S. im 2 mph faster than the odometer so at 60 mph im actually going 62/G.P.S so am i putting less miles on than im actually driving? if i drove with the cruise on at 60/odometer for an hour ive traveled 62 miles /G.P.S. right?

 

i have 285's on mine and when i use gps my gps says im doing 62 when im doing 60....may be the gps? or our speedos could be off?

 

i have 285's om my tacoma and my speedo is around 9mph off at 60,

so im actually going 69mph. so yes you are putting less miles on the odo.