Dodge's craziest number for the Challenger SRT Hellcat is the mpg

Dodge's Challenger SRT Hellcat made headlines for its 707HP engine, but its efficiency that might be the most astonishing thing about the ridiculously powerful muscle car. The coupé can certainly muster up an impressive turn of speed, as we discovered after taking it out on the track, but according to the EPA you can also get 22mpg out of it. …