2015 Dodge Challenger SRT Hellcat rated at 22 mpg on the highway by EPA

Article by Christian Andrei, on September 18, 2014

The 2015 Dodge Challegner SRT Hellcat is not only the most powerful coupe found in the company’s lineup but also impressed us with its EPA fuel-economy rating of 22 mpg on the highway when equipped with the TorqueFlite 8-speed automatic transmission.

According to Dodge, the Challenger SRT Hellcat not only more powerful but also more efficient than supercars such as the Lamborghini Aventador Roadster ($425,845) which returns 18 mpg on the highway, the Aston Martin Vanquish ($287,820) with its 18 mpg on the highway and the Mercedes-Benz SLS AMG GT ($221,580) which returns 19 mpg on the highway.

When using the six-speed manual transmission, the Challenger SRT Hellcat returns 21 mpg on the highway. For those who don’t know, the 6.2-liter HEMI Hellcat found on the Challenger SRT was rated at impressive 707 hp and 650 lb-ft (881 Nm) of torque.

Priced at $59,995, the Challenger SRT Hellcat will not be too easy to find, as we believe it will not sit in the dealer’s lot. Dodge said that the Challenger SRT allocation will be based on the number of vehicles sold by the dealer in the previous 180 days.

Press Release

707-Horsepower Dodge Challenger SRT Hellcat Earns EPA Highway Fuel-Economy Rating of 22 mpg

The supercharged 6.2-liter HEMI Hellcat benefits from content that is 91 percent new, compared with its 6.4-liter SRT cousin, better known as the 392 HEMI.

Engineered in-house, the Hellcat engine is designed for optimum durability in the face of the enormous loads that accompany its prodigious power. Its 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 HEMI Hellcat further benefits from premium-grade, heat-treated aluminum-alloy cylinder heads that 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.

So effective is this feature that engine power will not be derated due to cooling demands, even after 20 laps of a grueling 3.1-mile road course where the ambient temperature is 100 degrees Fahrenheit (38 degrees Celsius).

The HEMI Hellcat does not lack for style, either. Its die-cast aluminum rocker covers echo the block's Street HEMI Orange motif.

The car's new TorqueFlite eight-speed automatic transmission boasts maximum engine-torque capacity that is 30 percent greater than any eight-speed previously offered by Chrysler Group. To ensure its responsiveness matches the demanding expectations of SRT customers, the transmission features 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.

The defining benefit of the gearbox is its 7.03 ratio spread, which enables the powerful HEMI Hellcat to operate in its most efficient mode, more frequently.

Not to be outdone, the Challenger SRT Hellcat earns an EPA highway fuel-economy 21 mpg when equipped with its new-for-2015 six-speed manual transmission. The sporty gearbox boasts an internal cooling pump and external, vehicle-mounted oil cooler and its beefier 258-mm heavy-duty clutch affords easy access to HEMI Hellcat's prodigious power.

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