How much Fuel is enough?

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Desert Runner

Rank VII
Launch Member

Expedition Master III

8,507
Southern Nevada
First Name
Jerold
Last Name
F.
Member #

14991

Ham/GMRS Callsign
/GMRS=WREA307
I'm planning a trip through the upper Mid-west this summer (North/South Dakota, then into Wyoming and Colorado). I expect along the highway portions (which honestly will be the majority) that fuel won't be too hard to come by... but when I start adventuring off the highway, how much fuel should I keep available? I figure my main tank (16 gal) will last ~250 miles, give or take.
At least 1,.... 5 gallon spare and your tank as full as possible at the trail head entrance. Doing a winter project(Canada/Alaska), we were instructed to fill the vehicle at every opportunity because many places were either on reduced hours, or closed for the season during the winter.