35 vs 37 Fuel economy different?

[Jack55]

Is there that much of a different in real world economy between these? Im debating on if i want to pull the trigger on a 37 package at my local dealership for msrp Ill be upgrading from a 2019 Ram rebel which to be fair gets me currently like 13mpg with 40% local and 60% high way driving LOL anything better than that i think ill be happy.

 

[98rangerdave]

I cannot speak to the Gen 3, but I can speak to real world MPGs going from the 35 to a 37. I have a 2012 (I know, but the same at all) with 4.10 gearing. 35s netted me low 14s combined (70% freeway, 30% city) and 37s net me high 12s combined, same driving mix. I would say yes, you will see a decrease in MPGs with larger tire option.

Per the Ford specs, looks like you lose 1 mpg overall with the 37 package, about the same as I lost in the real world going from 35s to 37s.

 

[FordPerf Addict]

what is everyone getting real world? Im esp curious about 37s
I only ask because I'm currently getting 12.5-13.5 on my Gen2. leveled with 35s. I do drive about 75-80 on the highway so i am trying to compare

 

[Ta2punk]

Couple threads on this already. Search the forums. There is a 2-3mpg loss from the 35 to 37. You won't see anything above 14/15mpg if you are lucky even with mostly highway driving with the 37's. 16-18 with the 35's.

 

[kandewinn]

Reviving an older thread, but my 37pp is averaging 16.5. And I’ve seen it at 17.1. Mixed highway and city.

 

[Booth9999]

My 37 package is getting the same mileage as my get 2 right about 14-14.5 but she is still breaking in at only 700 miles. All mountai driving so I’d say you could get 17 on the highway. Gen 2 was on 35’s.

 

[Booth9999]

Couple threads on this already. Search the forums. There is a 2-3mpg loss from the 35 to 37. You won't see anything above 14/15mpg if you are lucky even with mostly highway driving with the 37's. 16-18 with the 35's.

Not what I am seeing in my truck. They are actually really close in my use case.

 

[shigman]

I have noticed a bit of a performance boost and MPG boost past 1000 miles on my gen 3. Initially i could barely crack 14 on a 35 model.

 

[HighwaySentinel]

Reviving an older thread, but my 37pp is averaging 16.5. And I’ve seen it at 17.1. Mixed highway and city.

You are one of the only people I can think of that seems to be getting this mpg. I need to start driving downhill everywhere.

 

[kandewinn]

You are one of the only people I can think of that seems to be getting this mpg. I need to start driving downhill everywhere.

Don’t know what to tell you. I drive 75 on the highway. I’m consistently getting 590-594 miles per tank. And I’m an MedEvac pilot in Upstate NY for work, so it’s definitely not downhill.