outceltj

I have had to change my tune with my hand held when traveling b/c not all areas carry 93. So its a good idea to keep ur handheld in the glovebox. However when i changed it from a 91 to a 93 I just run it down as far as i think its safe to do so before running out and then fill back up with 93 and no problems

Nuke

I think the tags read "Contains up to 10% ethanol".

It will still work but you'll lose a bit in performance and gas mileage. Any gas with ethanol will cause diminished performance and economy. From tank-to-tank, the same fuel from the same station can vary in % ethanol content from delivery to delivery. One delivery may have as little as 2-3% and the next could be 10% or more (try to figure out your cars average fuel mileage based on that scenario alone and it's daunting).