National gas average rises above $4 a gallon

(CNN)– $4 gas is holding.

AAA says the national average for a gallon of regular gas on Tuesday, July 21, is just over $4.

In South Carolina, the average price for gas is $3.70 cents a gallon.

That’s up slightly from Monday, July 20, as the U.S. and Iran continue trading strikes.

AAA says diesel is now averaging about $5.14 a gallon, nearly four cents higher in a day’s time.

Experts say higher diesel costs can put inflationary pressure on goods moved by semi-trucks across the country.