I was born into the world of buying gas when I had a minimum wage job and had just gotten my license. In one hour working as a cashier for minimum wage I made 4.25. That was enough to purchase 8.125 gallons of 87 octane gasoline.
If I had the same job now, I'd be making 14.25. That's enough to buy 3.104 gallons of the same gas at the same station.
Minimum wage has gone down by more than 5 gallons of gas since 1991.
Edit: I mathed wrong. 4.25 would have gotten me 8.5 gallons of gas in 1991.