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New RAM 1500 Hemi 5.7 only getting 9-10 mpg!

chloelight

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Hi you all. New RAM owner here. I own a 2019 RAM 1500 5.7 Hemi Laramie Sport. Recently I have been getting 9-10mpg on the highway and in the city. It is driving me crazy. I recently did a road trip (towing 4,000lbs) and that's when I noticed it changed. Even though I am not towing now the mpg has stayed the same. Before I towed I was only getting 12 mpg. I have the 21-gallon fuel tank and have to fill it up every 2.5 hours! So, I would love your opinions- should I add an additional tank? How can I fix this issue? Or should I just get a different truck or model and trade this one in?
 

yankeefan31569

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i run mid-grade citgo or mobil gettn 15-16 city 20-22 highway, somethings not right with ur Hemi..
 

ColoradoCub

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If you haven’t reset your fuel economy average on the screen it’s going to stay low after a trip towing and getting low fuel economy. Have you reset it since you got back?
 

Stevenc150

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If it's a brand new truck, mpg will get better as the engine breaks-in...thru 10,000 & more in my exp. Also an oil change ~2K to full syn will give a slight bump (I do this in case there's any metal particles from break-in of new engine in the oil). Next oil change (~10k) can give another little bump. (Admittedly I "over-change" mine because whats the harm and its easy)

Main thing is u have a ~400hp/torque hemi...enjoy it instead of sweating the mpg. It's a V8 truck dont expect V6 mpg and dont believe every mpg someone says they're getting. Just my $0.02
 

Neurobit

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That's good...I get 8-10 city (I have a stupid-short commute...) :oops:
 

mikeru82

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I'm assuming you're relying on the fuel mileage calculated by the trip computer and not hand calculated. If so, I think ColoradoCub nailed it.
Just to clarify, you don't have a 21 gallon tank. The only tank sizes available for a 2019 Ram 1500 were 23, 26, or 33 gallons.
 

Timeless

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The onboard computer for me is within .1 of my fuel app...so I think it is pretty accurate.

FYI I get 13-14 MPG and I have about 5600 miles on the truck now. Almost all city driving though.
 

SD Rebel

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As mentioned, reset your computer and try to take it little easy and see where you can be. The Hemi acts like a turbo motor when it comes to fuel economy. Which means it actually gets decent mpg when taking it easy, but gulps down fuel when on throttle. It can be a huge variance depending on how discipline you are with the throttle.
 

SCasey89

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As SD Rebel said, your driving habits can play a huge role in the mpg you see. There are also other factors such as does the truck have any type of lift and/or larger tires? Being a 2019, was the truck purchased new or used? If it was purchased used, you unfortunately don’t know how the previous owner treated the truck (driving habits, etc.).
 

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