Tow/Haul bad fuel economy

[Rfelton]

Hey guys

I have a Ram 1500 Long horn with a 5.7 Hemi.

Recently the dealer did a flash to the transmission per a recall.

Since then my fuel economy has gone down hill.

I recently did a 15hr trip towing a 20’ camper. My mpg was averaging 8.3mpg. The truck never left 6 gear. In tow/haul mode or without. No changes.

Previous to the new flash when I did this same trip I averaged 12.2mpg and 7th gear was the best I could get.

Anyone else have this same issue?

 

[Ramcharger60]

Hey guys

I have a Ram 1500 Long horn with a 5.7 Hemi.

Recently the dealer did a flash to the transmission per a recall.

Since then my fuel economy has gone down hill.

I recently did a 15hr trip towing a 20’ camper. My mpg was averaging 8.3mpg. The truck never left 6 gear. In tow/haul mode or without. No changes.

Previous to the new flash when I did this same trip I averaged 12.2mpg and 7th gear was the best I could get.

Anyone else have this same issue?

I had mine refreshed also and I can get it in 7th on flat road. As for the mileage I'm about 8 also but i pull a 9k# TV so i expected low mileage. Do you have the 3.92 gear? If you have a lower gear like 3.23 that might be the reason

Sent from my SM-N960U1 using Tapatalk

 

[crash68]

Since your transmission was flashed, it's probably still going through the learning process. Similar complaints popped up on an EcoD forum after a trans update(Hemi uses the same trans), several reported fuel economy came back after a while.
Fuel economy while towing is more influenced by wind load than actual weight. Towing the same 24' (3K lbs) in calm to no wind I'll get close 16-17 mpg, once the wind kicks up it will struggle to get 12mpg. When I tow my boat(also 3K lbs), I get about 20. I also tow a 28' (fully loaded 8K lbs) and get in the 14-15mpg range. Granted this is with a 3.92 EcoD, so subtract probably 6-8 mpg off those values for the Hemi.