Another New Ram Rebel: Here Is a Highway MPG Loop With Better Results

ram rebel air suspension v8 hemi mpg highway loop
Ram Rebel (photo:

If you follow TFLtruck, you know that our current long-term test truck is a 2019 Ram Rebel. We bought it back in November 2018, and put it through a few tests. We ran several highway mpg loops with it with disappointing results.

Our friends at ran their own real-world mpg loop and came back with a result better than what we saw a few months ago.

We run our 98-mile (aka. 100-mile) mpg loops on I-76 in Colorado (Hudson to Fort Lupton) at around 1-mile above sea level. We run the trucks at 70 mph using cruise control. This is a relatively flat stretch of highway in the plains of Colorado.

Our long-term Ram Rebel is equipped with a 5.7-liter V8 with the eTorque mild-hybrid system. The transmission is an 8-speed automatic. Our Rebel is riding on steel coil spring suspension (not air suspension). Since it’s a Rebel with a steel front skid plate, the truck does not have a retractable front chin spoiler.

The best highway MPG we got was 17.9 MPG (see video below).

The guys at tested a 2019 Ram Rebel with a 5.7-liter V8 and an 8-speed automatic transmission. This truck did not have the eTorque mild-hybrid system. This other red Ram Rebel was equipped with four-corner air suspension.

This other test was done at around sea level, near Vancouver B.C. Canada. This other Ram also used 87-octane fuel, just like we did in Colorado. Both used the same double-click (30 seconds) fill up method.

The Canadian test also focused on highway fuel economy at or near 70 mph, but they ran into some traffic and averaged a slower speed.

In the end, the Ram Rebel without eTorque and with air suspension got 19.49 MPG.

Indeed, these two trucks we tested in different locations and at different times, but what is going on with this difference in fuel economy?

First, neither truck met the Ram and EPA-estimated 22 MPG on the highway.

There may be two other explanations to the better MPG result in Canada.

First, the truck with no eTorque weighs a little less than the other one that has the mild hybrid system. The eTorque system adds an electric motor under the hood and a 0.4 kWh lithium-ion battery behind the rear seat.

Second, the Rebel with air suspension has an ability to lower itself into “Aero” mode at higher highway speeds. Aerodynamics are very important for truck efficiency. This is why most new trucks have low chin spoilers up front.

We purchased the truck with steel coil suspension, so we can modify it more easily. Please stay tuned for a video series where we show you many Mopar Performance and Teraflex parts on our long-term Rebel.

Andre Smirnov is an Automotive Enthusiast, Producer, Reviewer, Videographer, Writer, Software Engineer, Husband, Father, and Friend.