⚡ Ford Lightning Forum ⚡ banner

Range Plunge With Modification

2941 Views 19 Replies 10 Participants Last post by  RickKeen
Three weeks with a Lariat and the extended battery pack. Added a 2" levelling kit and replaced OEM 275 60 R20 General Grabbers with LT 295 60 R20 Falken Wildpeaks. Mounted them on the OEM wheels. Lost 60 miles of range. Can the coefficient of rolling resistance be that much higher on the Falkens to do that ?
1 - 1 of 20 Posts
Rolling resistance is highly sensitive to tire pressure. Did you inflate the new tires all the way to maximum pressure?

Its not just the rolling resistance of the tires that kills the efficiency. The air resistance is also a large factor.
You went from 356 square inches of frontal area per tire to 393.
Ignoring the tires being tucked into fenders, you added a square foot of front surface to push through the air. The truck is about 36 square feet to start with, so you added just under 3%.

Air resistance impacts the drag by a factor between the square and the cube of the speed. You can make up for a 3% loss in aerodynamics by driving 1% to 1.5% slower.
  • Like
Reactions: 1
1 - 1 of 20 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.