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Old 05-29-2018, 07:55 AM   #43
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Thread revisit

I, like RobertSunrus, am revisiting this 2014 thread. My previous post described my towing with a 2009 Ford F-150 4.6L HO engine with 6 speed. Ironically, that engine transmission combination is very similar to the GM 5.3 L in gearing and power.

Since that time, I purchased a 2015 F-150 with 3.5 eco boost and 6 speed aluminum and even more recently, a 2017 F150 3.5 eco gen 2 with 10 speed. The recent trade was based on an electrical issue with the brake controller and changes made to the truck post 2015.

IMO, no matter what brand you purchase, the most important factor you can observe is the engine's torque curve at RPM and the gearing of the truck including transmission. It determines, regardless of brand, how the truck will perform towing. I did not notice any better MPG when I switched from the 2009 4.6L to the 2015 3.5 Eco. but I had way more power and effortless hill climbing (no engine roaring). Both trucks pulled well but the '09 had much less torque and struggled more as observed by the gearing down and high RPM on climbs.

Comparing the 2015 to the 2017, (6 speed vs. 10 speed) there is another noted difference in my experience. Neither struggle with towing 7000#; however, the 10 speed provides a distinctively more refined towing experience with a quieter engine run and I have reached 14mpg several times on Florida roads towing at 65mph. Before I could only get about 12-13mpg around 60mph and with optimal conditions. The payload ratings of the F-150s, with max tow, will pull Airstreams. The consideration is how much "other" you have to load. Loading most things into the trailer instead of the bed will help but people weight and bed items determine what kind of vehicle you will need.

SIDENOTE: Never forget that tongue weight, that weight that bears down on the truck and hitch, are counted as payload/cargo, etc., and while weight distribution hitching will help with safety, it does not subtract any weight as some sales people have been telling new owners. The evidence of such is that tongue weight is measured BEFORE hitching to determine if the hitch is adequate for the task and also applies to the truck payload. The dead weight rating for the hitch is much lower than the WD (weight distributed hitch rating) and BOTH are based on BEFORE hitched weighting.
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Old 05-29-2018, 10:05 AM   #44
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Rear axle gear ratios

My 2016 Tahoe with a 3.08 axle, towing my 2014 Airstream 28' Intl gets 12-13 mpg. I tow all over the West Coast & AZ. Chevy delivers most of their Tahoes with the 3.08 ratio, except in high alt./mountain areas. In those cases, 3.42 is a better application.

Yes, a 3.42 is better for towing, but your gas mileage will suffer. You have to ask yourself, what percentage of the time will I be towing, vs. non-towing.
Myself, towing makes up only 1/3 of my mileage each year. Non-towing I get 18mpg combined, but highway mpg can be as high as 30 mpg. With my 3.08 ratio, I have no problem in mountainous terrain, usually going up 4000-6000 elev. mountains. Much better than my E450/Triton V10, class C did.
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Old 06-23-2018, 01:21 PM   #45
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For towing our AS FC23FB our TV was a 2010 Tahoe LTZ (130k mi) and recently traded to Tahoe to 2018 RST Tahoe 3.22 ratio, 10 speed, 6.2L +100hp (420 hp; 460 ft-lb) for next 150 kmi......Going to find out real soon mpg ....some data during breakin’ period (500 mi). This will be the largest trailer we will ever tow so for us a good fit...and the garage too. Attachment 314899
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Old 10-05-2018, 01:00 PM   #46
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MPG on 5500 mile trip

Just returned home from 5,500 mile trip with 23' International FB. TV is new Duramax 2500 GMC Denali Truck. I traded in my 6.2 litre Yukon for the 2500 and sure glad I did! Such a better, safer ride and LOVE the exhaust brake on the diesel. Drove the Chief Joseph Highway into Yellowstone with complete confidence. And, nearly 15 MPG ain't bad!
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Old 10-06-2018, 08:19 AM   #47
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Quote:
Originally Posted by jftompkins View Post
For towing our AS FC23FB our TV was a 2010 Tahoe LTZ (130k mi) and recently traded to Tahoe to 2018 RST Tahoe 3.22 ratio, 10 speed, 6.2L +100hp (420 hp; 460 ft-lb) for next 150 kmi......Going to find out real soon mpg ....some data during breakin’ period (500 mi). This will be the largest trailer we will ever tow so for us a good fit...and the garage too. Attachment 314899


Trip log: 12.1 mpg (mid-grade fuel) KC to Yellowstone round trip (v 2010 Tahoe at 10.0 mpg) ....10 speed trans great on mountain passes/and passing lanes too...about 20% increase in mpg/fuel range. Hitch modification required last minute to longer shank for E4 to level out....for long a smooth ride.
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Old 10-07-2018, 06:00 AM   #48
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Quote:
Trip log: 12.1 mpg (mid-grade fuel) KC to Yellowstone round trip (v 2010 Tahoe at 10.0 mpg) ....10 speed trans great on mountain passes/and passing lanes too...about 20% increase in mpg/fuel range. Hitch modification required last minute to longer shank for E4 to level out....for long a smooth ride.
@jfthomkins, that sounds great. Hopefully someday I will get out there and be able to report mpg too!
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Old 10-07-2018, 07:03 AM   #49
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Nissan Armada with 5.3(?) V8 and max tow packahe rated for 9000 lbs. geared for towing but dont know ratio. 28’ AS 7500 gross.

We get 11-11.5 mpg flat to rolling hills, 10 in big hills.

Best tow speed for us is 63-65 mph. Less than that and RPMs / torque is too low to pull rolling hills.
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