Cheap fuel over the last three years has had its effect: pickups, SUVs, and larger vehicles have been disappearing off dealer lots while smaller, more economical car sales in many cases have languished. Fleets have found truck fuel efficiency technologies harder to justify with slower ROI. Are we on a collision course with fuel prices?

Since last October through April 2018, according to Motus, fuel reached an average of 25.6% of vehicle costs—the highest it'd been since 2015. 

On the fleet side, where there are far more miles driven, diesel now accounts for some 61% of the total cost of ownership of a heavy-duty truck, according to Fleet Advantage, a fleet financing and business analytics provider. And that number is also on the rise.

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