According to the U.S. Bureau of Labor Statistics, prices for car and truck rental were 28.77% higher in 2017 versus 1997.
Between 1997 and 2017: Car and truck rental experienced an average inflation rate of 1.27% per year. In other words, car and truck rental costing $20 in the year 1997 would cost $25.75 in 2017 for an equivalent purchase. Compared to the overall inflation rate of 2.14% during this same period, inflation for car and truck rental was lower.
Raw Consumer Price Index data from U.S. Bureau of Labor Statistics for Car and truck rental: