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Regular or Premium

144K views 347 replies 81 participants last post by  hokiefyd 
While I agree I still wonder if there is any difference between regular and premium. The Mazda CX9 shows different power numbers depending on the fuel and I wonder if the Ascent would do the same thing.
Extremely difficult to know unless it's measured (i.e. on dyno). I wouldn't even try it because it's senseless.
 
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