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Yoss,

My family and I just finished a trip from Kalispell, MT to Jasper, AB with our R1T. We had 5 bikes over the bed and we were pulling a 27' Keystone Passport camper. The overall trip was 1300 miles and speed (wind resistance) was the largest factor. Case in point - the longest leg without charging was 132 miles and 6700' of elevation gain. I was able to squeak out 1.16 mi/kwh through very conservative driving.

In preparation for the trip I did a lot of tow testing with a variety of trailers at various highway speeds. I found that on a 62 mile loop with roughly 680 feet of elevation gain I saw the following efficiencies:
1. R1T in conserve - 2.69mi/kwh @ 51mph avg*
2. R1T in towing w/ flatbed trailer weighed down to ~5000# - 1.48mi/kwh @ 45mph avg*
3. R1T in towing w/ Keystone camper (approx 5500#) - .92mi/kwh @ 48mph avg*
4. R1T in towing w/ empty cargo (probably 3500#) - 1.06mi/kwh @ 47mph avg*

As is noted all over on the Internet wind resistance is the largest consideration as drag increases (if nothing else changes) as a function of the square of your speed. This is why trains are so efficient. Once they get their load up to speed the energy required to keep it moving is less.

The final tow test that I did pre-trip was to drive a 126mi route with 4400' of elevation gain (and loss) as an out and back. I got the following results:
1. 1.11mi/kwh @ 44mph avg - Cruise Control set at 55mph*
2. 1.15mi/kwh @ 44mph avg - "hypermiling" by speeding up going down hills and slowing down going back up hills**

This gave me the confidence that I could make an appreciable improvement in my efficiency by constant throttle rather than constant speed.

592wh/mi is equivalent to 1.7mi/kwh. I achieved this efficiency with a motorcycle on a hitch rack and pulling a lightweight (1500#?) trailer with a raft on it for ~140 miles. My average speed was 46mph (but this likely included loading and unloading the raft, so actual driving speed was much higher).

If you are okay with driving slowly (targetting 55mph give or take) I think 1.7 mi/kwh may be achievable depending on the cross section of the teardrop. If it's a shorter teardrop this seems within reach. If it's taller you will certainly see better numbers than I saw on our trip (up to 1.2 mi/kwh) but may not get to the full 1.7.

I hope this helps. If you have more specific questions let me know. I would love to pull more trailers on my course to get additional data. I am trying to line up an airstream so I can compare it apples to apples against my Keystone at the same speeds. I'd really like to understand if their shape makes that much difference...

Notes:
*These tests were done using the 22" Rivian wheels and Scorpion Zero tires
**This result came with new 20" American Racing wheels and Scorpion AT tires AND 5 bikes over the bed of the truck.

Seth

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Pictures are in my post. The bikes may make a difference but my guess is that it's small in comparison to the wall that is the camper but you never know. It would be interesting to church out.

Putting the 5 bikes in the camper with the slideout closed is not possible. Better to install a hitch mount on the trailer but, again, I think the numbers I have been looking at show a small impact in relation to the trailer itself.
 

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I've heard that also. I've tried to limit the number of variables in my testing but this is certainly an area that could warrant some more investigation. I'll try to find time to run a few more routes to see if I can identify any discernable differences.
 
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