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If you're on the highway you should be able to hit 300 miles per tank if needed. At this altitude, you don't need 93+ octane. The reduced air density allows for lighter octane, 91 is typically the max you'll find here.
Have you been calculating your ACTUAL mileage? (fill tank to full, then use as much as you can, then divide the miles driven by gallons required to refill).
October in the Rockies is a crapshoot, my snow tires are usually on before October ends. October is typically when the first snow hits the Denver area, but the hills may already have coverage by then. Usually the ground and climate are not yet cold enough for it to really stick to the roads around Denver, so they might be wet and slimy and sandy from mag chloride, salt, and sometimes small grain gravel.
If you're sticking to highways and major roads, I wouldn't worry about it. You can always plan a SAFE route, and then a FUN route (if time and conditions permit). If you're going to be travelling over any passes (Independence Pass or Loveland Pass for example) definitely check conditions of the pass before attempting the drive. Weather may be beautiful until you hit the pass at high altitude, then suddenly you' find yourself in blizzard conditions with 50mph winds.
What part of the Rockies will you be driving through? If you're interested, I may be able to recommend some roads if you'll be in any areas I'm familiar with.
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