Average U.S. gasoline prices are up 22 cents per gallon during August, and diesel prices are 19 cents per gallon higher, mainly on the strength of crude oil prices.

Benchmark crude oil increased 70 cents a barrel on Tuesday in New York to close at $93.43, an increase of $5 a barrel this month. Brent crude rose 43 cent to close at $114.03 per barrel on the ICE Futures exchange in London. Brent crude has gained more than $8 per barrel during August.

Retail gasoline topped the $3.70 threshold for the first time since May 19, and the national average has climbed by more than 30 cents per gallon during the last month. Recent surveys suggest 39 states are now seeing higher gasoline prices than at the same time last year.

Trading in oil futures markets was supported by surprisingly strong July U.S. retail sales data.