Changing Tires

Erika Lozano

2010 Ford F-150 Platinum

Factory Tire: P235/75R17

Comes on the 2010 F-150 truck, and ranges around $300
MPG: 15


Tire: P235/75R17

  • Width (mm): 235mm / 9.3in
  • Aspect Ratio (%): 75% / .75
  • Height (in.): 7in.
  • Diameter (in.): 31in
  • Circumference (in.): 97.4 in.


Replacement Tire: P275/55R20

What I want to put on the F-150, it's a bit bigger and i like the color on the rims. It ranges around $324

MPG: 17.5


Tire: P275/55R20

  • Width (mm): 275mm / 10.8in
  • Aspect Ratio (%): 55% / .55
  • Height (in.): 5.9in
  • Diameter (in.): 31.8in
  • Circumference (in): 99.9in

"K" Ratio: 1

1) If your odometer reading is 50,000 (miles), you have traveled 51,283.4 miles on the new tires.

2) If your reading is over 70, your speed is 70 miles per hour with the new tires.

3) If your mile per gallon with factory tires is 15, what is your mile per gallon with the new tires? 17.5