Poor fuel mileage highway

[Raylan GIvens]

The 3.92 uses a lot of fuel on the highway once you start getting past 65-70 MPH. My mileage can only come close to matching the window sticker if I drive 55 MPH

 

[gHiDoRa]

I would never buy a truck if i'm worry about MPG.

 

[gmpenn]

5.7L Engine Do not use E-85 flex fuel or ethanol blends greater than 15% in this engine. This engine is designed to meet all emissions regulations and provide satisfactory fuel economy and performance when using high-quality unleaded gasoline having an octane range of 87 to 89 as specified by the (R+M)/2 method. The use of 89 octane “Plus” gasoline is recommended for optimum performance and fuel economy. While operating on gasoline with an octane number of 87, hearing a light knocking sound from the engine is not a cause for concern. However, if the engine is heard making a heavy knocking sound, see your dealer immediately. Use of gasoline with an octane number lower than 87 can cause engine failure and may void or not be covered by the New Vehicle Limited Warranty. Poor quality gasoline can cause problems such as hard starting, stalling, and hesitations. If you experience these symptoms, try another brand of gasoline before considering service for the vehicle.

 

[CrazyWorld]

I've got the 5.7hemi with a 3.92 4x4 crew cab and tow package.....about 2400 miles on truck....I average 21mpg on highway.....I hope you guys are correct.....if mileage improves.....I will be really happy.

 

[Hydroblueguy]

I've got the 5.7hemi with a 3.92 4x4 crew cab and tow package.....about 2400 miles on truck....I average 21mpg on highway.....I hope you guys are correct.....if mileage improves.....I will be really happy.

What fuel are you using? 87? 89? 91?

 

[AndreiV]

I have 5.7hemi with a 3.92 rear and 4x4 crew cab, almost 11k miles, averaged 21.2 mpg on the 1k miles round trip mostly @65mph through mountains, from Orange County CA to Lake Tahoe CA (5 people + 500lbs in bed) on 87 octane.

City average about 13.5mpg.

 

[yifa]

I bought my rebel last month so far 1500 miles on it average 14 mpg and I try to drive like a grandma still under 15mpg.

 

[Ickabod]

I would never buy a truck if i'm worry about MPG.

I totally agree, but with 20k miles, I am averaging 10.7 in the city. seems a bit low even for city. This is not towing anything either. 3.21 axle and 18" stock tire. 87 non-ethanol gas.

 

[Scottg918514]

2019 5.7 hemi with 3.92,e torque. Rated at 17-22. Highway mileage is only around 16-17 and that’s driving speed limit, not passing etc. Truck only has 1300 miles on it. However it’s getting better mileage in town 17 mph, that etorque really seems to help in town? Just wondering if others have had same problem. Maybe better once I get a few more miles put on it? I was hoping for 21 at least.

I have same setup and 3k miles. Just got low 18s on a long highway trip. It is the 3.92 gearing. the 17/22 is for the 3.21 axle

 

[renzo2213]

I have same setup and 3k miles. Just got low 18s on a long highway trip. It is the 3.92 gearing. the 17/22 is for the 3.21 axle

Yea I was going to say the numbers they post is got the most economical model which would be etorque 3.21. I have the 3.21s and I average 17, because I mainly do city driving. Highway I’ll average 22-24 easily


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[Mvp_Me]

2019 5.7L crew cab 2wd with 3.92 gears and no e-torque, I also have stock 20’s and still running oem tires. I use 89 octane, 8k on the truck and currently using shell full synthetic oil. I haven’t gone a very long trip but going across town I can get 23-24mpg and in the city about 14-15mpg. I have a afe intake and I filled my tires with nitrogen. I also live in Florida where there’s no hills/mountains and I’m at sea level. I used to watch my mpg like crazy and barely touch the gas pedal but I’m over it and drive how I feel.


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[Mvp_Me]

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[agillott13]

Wow seeing you guys with 3.92s getting close to 20 makes me really wonder what’s wrong with my 3.21 4x4 Laramie sport... first highway trip was 160 miles round trip averaged 14.8. The instant readout never even saw 20 while at speed... it just now has 900 miles on it, so maybe it’ll get better, but right now I’m not impressed.

 

[Dusty1948]

"The stated mpg on your window sticker was based on a 3.21 rear axle truck with standard 18" wheels and street tires. However, FCA was allowed to "blanket" that mpg to all the different trim levels across the board, including the Rebel."

All manufacturers do the same thing because it cost money to get the government certification. To do this for every conceivable configuration that could effect fuel consumption would be time consuming and expensive. I suspect your comment on tires was spot on. Take the Rebel's stock tires off and install 18 inch wheels and passenger grade tires and I'm betting the EPA figure would be met and probably exceeded.

The last I knew they run the EPA certification cycle for two wheel drive and four wheel drive for each engine combination.

Best regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 17 July 2018. Now at: 030139 miles.

 

[Maconi]

I totally agree, but with 20k miles, I am averaging 10.7 in the city. seems a bit low even for city. This is not towing anything either. 3.21 axle and 18" stock tire. 87 non-ethanol gas.

I wish I could get 10.7 lol.



5.7 Hemi eTorque, 3.92 axle, 22" wheels, 89 octane

Mostly city driving between 35-55 MPH. Using adaptive cruise control the majority of the time (which has slightly aggressive acceleration but it's not flooring it or anything).

 

[SD Rebel]

All manufacturers do the same thing because it cost money to get the government certification. To do this for every conceivable configuration that could effect fuel consumption would be time consuming and expensive. I suspect your comment on tires was spot on. Take the Rebel's stock tires off and install 18 inch wheels and passenger grade tires and I'm betting the EPA figure would be met and probably exceeded.

The last I knew they run the EPA certification cycle for two wheel drive and four wheel drive for each engine combination.

Best regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 17 July 2018. Now at: 030139 miles.

Absolutely, I think they included cab/bed configuration as well. But I wished they did what GM did, who bothered to make an exception for their Trail Boss trim. Which is similar to the Rebel trim, with T/A tires (though smaller 32" vs 33") , higher axle ratio and ride height. They dropped the mpg rating because they knew it was going to affect it quite a bit compared to the rest of the trims.

There are a lot of new customers to RAM, many who are first timers with trucks, who won't understand how the axle ratios and wheels/tires will effect the mpg. I know from my own experience the window sticker wasn't realistic, but for some first timers, it will be quite the shock when they expected 22 mpg and are getting 16-17 mpg.

 

[nbomar]

My 2019 limited 4x4 with 3.21 axle gets 15 mpg on highway on a good day. I have the 22” wheels and swapped to nitto tires. Towing a 3k lb trailer I get 6-8mpg. It’s ridiculous.


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[Willwork4truck]

While operating on gasoline with an octane number of 87, hearing a light knocking sound from the engine is not a cause for concern.

Thanks for that reminder. I almost always hear a fainter pinging sound and have been debating what to do about it...

 

[timwarner]

I think its the gearing, my brand new 2020 Ram got 20.4 on the way home from the dealer , hiway 70-75 mph. I have 3.21 axle CC 4x4 Laramie sport.

I agree,definitely the 3.91s.I have the 3.21s in my longhorn,and am getting around the same,but only have 1200 miles on it,so it should improve after break-in.

 

[kapinallinen2]

12.5mpg commute to work at 6mph, 14.7mpg I-95 at 80mph. Not much different from my 235HP `97 Expedition 5.4 triton...