I run 63 to 70 towing a Subaru. Running the genny most of the time to keep the princess cool. 6.8 to 7.2 mpg. Rhonda drives 60 to 63 when she drives and the mileage will go up to about 7.5. Of course, I'm drinking coffee while she's driving, so as soon as we switch drivers the speed goes up and the mileage down :-)
I've done 7.8 on a long run in the winter without the genny and a tow car.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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