I run 87 performance as my DD. Now I have been told that our gas up here in Canada performs very well......probably very similar to 89 in the U.S.
Anyway, it's an excellent "happy medium" of performance and economy for DD'ing!
Do not be scared of the 87 octane.........many good tuners will tell you that our 5.4's actually like the cheap gas pretty well and obviously can save you some cabbage!
