Fifth wheel mileage question

[sportzfann]

Fiver owners, not trying to start a debate, but wanted some data to think about.
I have a 2017 f350 Dually diesel and I am looking at fivers in the 30-35’ range but the weights vary quite a lot I’ve seen 30’ at 9k lbs gvw. and 35’ at15k lbs. gvw
my question is will it make much difference in mileage pulling those different weights, and length trailers or is this a aerodynamic issue nor so much weight. ??

[MFL]

IMO, towing with the diesel, the weight will not make much difference. The height diff will make about the same diff as the weight.

Also if looking at GVWR sticker to compare, that may have more to do with axle/spring size, such as comparing 4,400 rated axles to 5,200/6000 axles. The beefier axles/springs allowing a higher wt rating, rather than actual scaled wt of the various trailers.

Jerry

[ReneeG]

I'm not an expert, but I think it's a little of both. Before we purchased our FW we had a 32' Komfort TT, 8 - 9k fully loaded that we towed with an F250 6.8L gasser. Got about 12 - 13mpg. Same truck towing the 13k fully loaded FW in our signature, 7, yes, 7mpg. Fast forward - same FW, different TV, 2011 F350 diesel dually, long bed, 12 - 14mpg.