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Old 08-21-2019, 07:41 AM   #15
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The lower air density at high elevations mean the big brick you are driving has lower air resistance to its movement, so your miles per gallon actually increases.
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Old 08-21-2019, 09:12 AM   #16
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The lower air density at high elevations mean the big brick you are driving has lower air resistance to its movement, so your miles per gallon actually increases.
Thatís good in theory but doesnít actually occur. The higher altitude lowers total power output so it has to work just as hard or harder to maintain speed.
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Old 08-21-2019, 10:21 AM   #17
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Thanks for all the input. I plan to fill up in Denver before I start the climb. Will be running the generator and not the engine ac.
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Old 08-21-2019, 01:11 PM   #18
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Thatís good in theory but doesnít actually occur. The higher altitude lowers total power output so it has to work just as hard or harder to maintain speed.
Actually, it does occur. I lived over 7000' for about 50 years and experience it all the time. The amount of air resistance strongly affects the power required to move the brick any time it is in motion and it is not a simple geometric relationship. The lower air density (and resultant lower air resistance) at altitude is certainly a fact even if you choose to discount it.

The factor about working harder due to the altitude related power loss (I won't go in to our coach being turbo charged) you are not taking into account is that, on average, you are coasting downhill (with your foot off the accelerator) in the mountains about as much as you are struggling to drive uphill, but the affect of lower air resistance is more or less a constant irrespective of going uphill or downhill.
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Old 08-21-2019, 07:37 PM   #19
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Just make sure to get the 97 octane mid grade, the high altitude regular is only 95, and since you are heading down to Utah you donít want any issues with the lower octane fuel.
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Old 08-21-2019, 08:22 PM   #20
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There are several fueling stations in Dillon and Silverthorne. Or wait to Grand Junction.
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Old 08-21-2019, 09:19 PM   #21
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Just make sure to get the 97 octane mid grade, the high altitude regular is only 95, and since you are heading down to Utah you donít want any issues with the lower octane fuel.

Your off by 10 octane, 87 octane regular is what Workhorse recommends for the 8.1 engine. 85.5 octane will work quite well at higher elevations. No need for higher octane premium fuel, they were not designed for it.
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Old 08-22-2019, 09:25 AM   #22
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Your off by 10 octane, 87 octane regular is what Workhorse recommends for the 8.1 engine. 85.5 octane will work quite well at higher elevations. No need for higher octane premium fuel, they were not designed for it.
This. I've never put anything higher than regular in my motorhome and that includes the lower octanes at higher elevations.
97 octane is racing fuel.
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Old 08-23-2019, 08:11 AM   #23
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Yeh, my numerical dyslexia was showing! 85 and 87 was what I meant. But stick with the 87 to avoid issues at lower elevations.
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Old 08-23-2019, 08:52 AM   #24
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87 octane is all I use. I do use 100% gas during the winter storage months.
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Old 08-23-2019, 09:23 AM   #25
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You don't need a strategy. Fill up on one side and stop for more when it gets down towards 1/4 tank.


Personally I like to have a full tank when leaving the cities behind and heading into the boonies. If for no other reason than knowing I have plenty fuel to run the generator if I get stranded for some reason.
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Old 08-24-2019, 11:16 PM   #26
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You don't need a strategy. Fill up on one side and stop for more when it gets down towards 1/4 tank.


Personally I like to have a full tank when leaving the cities behind and heading into the boonies. If for no other reason than knowing I have plenty fuel to run the generator if I get stranded for some reason.
Agree, pretty simple strategy thatís worked for me for 40 years.
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