For maximum EV efficiency, stick to 25 miles per hour, ignoring angry drivers

Ford Mustang Mach-E electric car can beat 60 miles per hour from a standstill in 3.5 seconds. Fergal McGrath prefers to hold the needle at a dangerous 40 mph. He’s looking for a different kind of bragging right.

Mr. McGrath is a hypermiler, one who tries to lure as much mileage as possible from his fuel, whether it is gas or electric. The practice requires driving at a breakneck pace to save energy, around 40 to 50 mph on a gas-powered vehicle. The efficiency of an electric car can be terribly slow – sometimes below 30 mph.