91 tune on 93 octane and i get better mpgs than i would w/o a tune or even with 89 and my truck runs a hell of alot better this way

 

Up here in Canada almost all our gas has ethanol its terrible.
I find the best mix of power and mpg is the 91tune with Shell 91Oct gas.
Has no Ethenol. a Blend of Shell91 and Sunoco 94 also has some good results..

 

I'm not entirely sure about Superchips, but Diablosport programs their tunes with gasoline that has up to 10% ethanol.
This means that all of their tunes were tuned with ethanol crap gas in tank. This allows everyone to utilize the tunes effectively without any damage that would result from tuning with 100% gasoline and guys using ethanol grade gasoline.

and rocket....I'm pretty sure the "Hemi Tick" is produced within the valve guides in which Chrysler allows a large tolerance in the specs for assembly.

 

Gas prices have never made much difference to me... I bought the truck knowing it was a truck...

However, it's a bit easier to swallow when you think:
30 gallon fillup at $2.89 for 87 = $86.7
30 gallon fillup at $2.99 for 91 = $89.7
30 gallon fillup at $3.09 for 93 = $92.7

$6 difference out of $90 for the price of a fillup compared to the time and expense for possible engine damage....