That's what it really comes down to... cost per mile. On our Expy, we saw some increase in MPG with 91, but the cost per mile was still lower than what we'd achieve with 87, so 87 is all we run. If prices dropped back down to sub $3.00 prices, then it might be worthwhile to run 91.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
Bring back  Windows™ XP and 7. 
Windows™ Vista and Windows™ 8 is a pain in my a$$! 
Windows™ 10 is only slightly less annoying! 
Windows™ 11 is garbage! 
Much to my surprise, I'm actually quite enjoying Linux! 
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