The US 50 shortcut is very doable, it is only 30 miles.
Why not take US 6-US 191 from Spanish Fork to Green River. It is a good road and will save you about 60 miles and 45-60 min. Get off the Interstates and see the Country.lol
If you can spare the time take in Moab, Arches NP, and Canyonlands NP. Use the mileage saved, Moab is only 32 miles off of I 70.
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