it's your car. better fuel economy on premium is what the gas company want you to think, they also want you to change your oil every 2 weeks. that only benefits them.
I've experienced this. And trust me its terrible in the carburetor ck2 lancer.
i Tried the octane boosters from in unipet and seems to burn less using super + octane booster. but its a CK2 lancer carburetor engine so give it a try u efi guys.
Small update: The blend isn't that drastically different after all as there are limits to how much of certain components can be used in blending. Seems like the issue is really your cars in some way.
OK guys so I have some what of a update. I've tried quite a few gas stations, And the mileage really varies. Some stations in south give me the most I would say yes. But will update more as I see fit.
