Chuck Grassley is 92 years old.
He was college age from 1951-ish to 1954-ish.
Gas prices were $0.27 to $0.29 a gallon back then.
https://www.energy.gov/eere/vehicles/fact-741-august-20-2012-historical-gasoline-prices-1929-2011
Adjusted for inflation, that's $3.37 to $3.49 today...
https://www.usinflationcalculator.com/
Buuuuut... Another way of looking at it...
The minimum wage in the early 1950s was $0.75/hr.
https://www.dol.gov/agencies/whd/minimum-wage/history/chart
So a gallon of gas was between 36% and 39% of an hours worth of minimum wage work.
The current minimum wage is $7.25 an hour. A gallon of gas at the current average of $2.847 is 39% of an hours worth of minimum wage work.