Younger consumers are more optimistic about the economy than their older counterparts.

The latest consumer survey from the National Association of Convenience Stores (NACS) has revealed that consumer optimism last month reached its highest level since March, following a 12 cent drop in gas prices.

Overall consumer optimism about the U.S. economy increased three points to 47% in July, but there were significant demographic variations. Six in 10 younger consumers (60%) ages 18–34 say that they are optimistic, compared to only 37% of those ages 50 or older.

Gas prices remain much lower than they have been in recent summers. This month’s reported price of $2.26 per gallon is 53 cents lower than the reported price of $2.79 in July 2015. As gas prices have declined, U.S. fuel consumers are less likely to say that gas prices significantly affect their feelings about the economy. Just one in five (22%) of fuel consumers say gas prices have a “great impact” on their feelings about the economy, the lowest number since NACS began surveying in January 2013.

Not only are consumers less concerned about current prices, they also feel good about future price changes. Only four in 10 (41%) consumers expect gas prices to increase over the next 30 days, the lowest percentage since February. And they say that prices would have to reach an average of $4.71—more than double today’s prices—before they would consider alternatives to driving or significantly reduce the amount that they drive.

The boost in consumer optimism regarding the economy may not immediately translate into a boost for the economy. Only one in five consumers (20%) say they will drive more over the coming month and only one in six consumers (16%) say they will spend more money shopping at all retail locations this month. However, both percentages are in line with historical averages for the month.

Fuel efficiency may also play a role in optimism. Consumers say their vehicle’s average fuel efficiency increased to 25.2 miles per gallon, the highest level since NACS began conducting monthly consumer surveys in 2013. As a result, average miles per dollar—a calculation that examines gas prices related to vehicle fuel efficiency—increased to 11.2 miles per dollar.

“Monthly changes in gas prices clearly affect consumer sentiment. The question is how much any future price drops can push optimism higher at a time when consumers still have broader political concerns, especially as the national conventions loom,” said Jeff Lenard, NACS vice president of strategic industry initiatives.

NACS, which represents the convenience store industry that sells 80% of the gas in the U.S., conducts monthly consumer surveys to gauge how gas prices affect broader economic trends. The survey was conducted online by Penn Schoen Berland; 1,101 U.S. adults who purchase fuel for a vehicle such as a car, truck or van at least once per month were surveyed July 5–8, 2016.