HOUSTON—Motorists in Texas are paying about half as much for a gallon of gasoline as they did four months ago.

AAA Texas on Thursday reported the average retail price of gasoline slipped 13 cents this week, to settle at $2 per gallon.

The nationwide average tumbled 16 cents, to reach $2.17, as crude oil prices slipped below $60 per barrel.

The association’s survey for mid-July showed the average retail price for gasoline in Texas was $3.98.

The price at the pumps in Houston and Corpus Christi this week averaged $1.93 per gallon.

El Paso had the highest average price, at $2.36 per gallon, which is still down 15 cents from last week.