@greenpony The sum of the trip odometer column is off by 20 miles for some reason...copying to Excel yields 3037.6 miles in 108.26 gallons, which is 28.058 MPG.
other than the final fill on 93, it doesn't look scientifically significant that octane made any mileage difference. Maybe temperature/humidity had a bigger impact. You had some similar numbers on the last 2 91 octane fills as the first 2 93 fills.
Winds generally go more west-to-east than east-to-west across the plains and the east (my trip from Michigan to Colorado and back two years ago being an exception in which I drove through wacky headwind storms both ways on different weeks), so I'd say it'll be tough to get the same mileage on the way back.
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I am pretty sure that was coming down a very steep mountain.
I'm done a few 1200-1400 mile road one way road trips. (most of the driving through nebraska/iowa/eastern CO/ S&N daktoa.
and if I can find cheap enough air fare. I wont do it again.
I figure ~400 dollars in fuel. + food. depending on the season, and how the drive goes, might add in 2 nigths of hotel.
at least 700 bucks in just getting to where I'm going.
I've made the flight to denver twice now. Paid 140 a person for 1 trip, 160 the 2nd trip.