Vehicles Tested with the Worst Highway MPG

A Jeep Gladiator Mojave returned the same highway fuel economy as a Ford F-250 Super Duty.

Since 2016, we’ve put hundreds of cars, trucks, and everything in between through our real-world highway fuel-economy test. We conduct every test on the same 200-mile out-and-back loop of highway and at as close to a 75-mph cruise as traffic will allow. The results are occasionally surprising but always illuminating.

Read more