When gasoline was $1 a gallon, mid-grade cost 10 cents more and premium ten cents more than that.?

I remember paying .17 cents a gallon, so the prices today create a looming question, as you say there is normally just .10 cents per grade difference, So the Oil companies have shown a chink in there pricing, They have given away a secret and didn't eveb know it, that in all refined fuels there is not basic difference for the exeption of a slight addative to raise the octane level.

Probably less than that .10 cents. Two in ground tanks provide fuel to three pumps. 87, 90 and 93 octane in Texas mid grade is just mixing some from each tank. Some crazy people think they can take some regular and some mid grade and get better running? High compression engines need octane to keep from detonation or ping!

its always been that way ,when i started driving gas was .25 cents a gallon back in the late 60,s and it was that way them but you had better grades of gas because it had lead in it,but was bad for the air we breath,but back then there was like a nickle difference in grades of it,and then you could really tell a difference in high test and regular,now days i cant really tell any difference in the way it runs in a vehicle.but for as long as i can remember there has always been a difference in the price of it,they says its because of the additives that are added to it,back then though we all ran high test in the cars we ran on the street.it did make a difference in them then,good luck ,hope this helps.

It's always been like that, even in the 70's. Not sure why. Filtering processes are not that much more expensive to yield the difference, not even a dimes' worth.

all gas is basically gas. stronger grades have additives,,,thus the extra price