I have had the same experience, better mileage outside of TX, with my 5.0 V8 F150 and chalked it up to less ethanol.
I guess it could be elevation or both, not sure.
-Brian
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2014 Bullet Premier 22RBPR - let the camping commence!
2013 F150 Platinum - 5.0 - 3.55 ELD + towing package
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