Diesel goes by cetane numbers. I believe 40 is the minimum number allowed in the US. Around here near STL, Shell seems to have the best rating at 45 I believe.
I think the premium fuel has a higher cetane number, or has additives like cetane booster, injector cleaner and lubrications added to it.
I think the premium fuel has a higher cetane number, or has additives like cetane booster, injector cleaner and lubrications added to it.