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Even if the van has milage estimates based on using unleaded premium, do you think it would function ok.... I mean couldn't the electronics compensate to some degree, with regular unleaded, or would damage occur ???
Most modern vehicles incorporate a Knock sensor in the Engine block which retards the ignition upon sensing any knocking, so I doubt if it would be problem using regular fuel.
I disagree,I think you would do damage and quite quickly if you choose to use on a regular basis standard fuel over premium if premium is what's required