Is 93 Octane worth the cost for towing?

[runJD]

Originally Posted by DarrenWS6

Any one use 93 for daily driving and notice any economical improvements with it when babying the throttle?

Yeah i tested it out between 87 and 93 octanes in my 4.6 a while back and I found a 2mpg increase in economy with 93. At those prices that worked out to a $.01 saving per mile plus better power! The proportion of increase in mpg exceeds that of the increase in cost per gallon in my case.

[Power Hungry]

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.