Or 21 mpg with the manual, as long as you don't try to reach its 199 mph top speed.
Right. So the Hellcat can kill 1.5 gallons of gas per minute, but if you don't floor it, you might get 21-22 mpg out of it while cruising on the highway according to its EPA rating. That's still not as good as the 2015 Corvette with the new automatic, but let's not forget that you get way more power than the alleged 707 hp from SRT for your $59,995. It will literally smoke all C7s without a Z06 badge.
Needless to say, that supercharged 6.2 Hemi is pretty special. Chrysler says it's "91% new" compared to their 392 (6.4) naturally-aspirated Hemi:
It's forged-steel crankshaft has induction-hardened bearing surfaces that contribute to its capacity to withstand firing pressures of 1,595 psi (110 bar) – the equivalent of five sedans standing on each piston, every two revolutions.
The heat-treated aluminum-alloy cylinder heads are optimized for thermal conductivity. These are topped by a twin-screw 2,380-cc/rev supercharger that features integral charge coolers and an integrated electronic bypass to regulate boost pressure to a maximum of 80 kPa (11.6 psi).
A separate low-temperature cooling circuit with two air/coolant heat exchangers integrated into the supercharger housing keeps air temperatures below 140 degrees Fahrenheit (60 degrees Celsius), while enabling air flow of up to 30,000 liters per minute.
The TorqueFlite eight-speed automatic is a beefy one featuring one additional pinion gear in each of the 1st and 3rd gear sets, and five more clutch-pack disks – two in clutch E and one each in clutches A, C and D to deal with all that torque. It comes with a 7.03 ratio spread.
The six-speed manual is no chopstick either, being equipped with an internal cooling pump and external, vehicle-mounted oil cooler, plus a 258-mm heavy-duty clutch. Good enough for 21 mpg on the highway.
That will do.