If you have spent any time close and personal Jeep massive new Grand Wagoneer SUV, then you won’t be surprised to hear that its fuel economy isn’t what we’d call stellar. It is huge, heavy, vaguely shaped like a brick, and equipped with a beautiful but resolutely old 6.4-liter Hemi V8 that produces 471 horsepower and 455 pound-feet of torque. But what if there was a better, more efficient way to get your GrandWag to move on?

There are, and it’s called Hurricane 510 in-line six-cylinder engine. It produces a wildly impressive 510 hp. and 500 lb-ft, and according to the EPA (as originally reported Autoblog on Monday), it does this more efficiently than the V8 version. How much more effective? About 2 miles per gallon, reports FuelEconomy.gov.

The 6.4-liter two-wheel drive Grand Wagoneer manages to return 13 mpg in the city, 19 mpg on the highway and 15 mpg together, while switching to all-wheel drive reduces the figure by one mpg from highway. The 3.0-liter six-cylinder turbocharged version will return 15 mpg in the city, 21 mpg on the highway and 17 mpg in the city in two-wheel drive, and again that number on the highway drops by 1 mpg when you cross all-wheel drive, while the city is also falling 1 mph.

More power and more efficiency is just the thing, right? Well, without riding a Grand Wagoneer with a new engine, it’s hard to say. The 6.4-liter engine is very much in line with the character of the luxury Jeep, but if the Hurricane can do its job quietly and make the driving sensation easier, then the Jeep probably has a winner.

Sure, there’s a $ 2,000 premium that Jeep is asking for a smaller six-cylinder engine that, despite other good qualities, may not be considered in the minds of some American SUV buyers, but still we’re excited to get some time driving with new transmission.