The national average price for a gallon of regular gasoline reached $3.98 on Thursday, marking a one-month increase of $1, according to AAA. As of Sunday, the national average remains at $3.98. In 13 states, the average price for a gallon of gas is at or above $4. In three of those states – California, Hawaii, and Washington – the average price is above $5.

However, in another 12 states, AAA data shows prices have improved since last Sunday, though maybe not entirely enough for you to notice. Georgia has seen the biggest decline in pump prices since March 22. The statewide average is $3.589 a gallon, slightly more than 10 cents down from the $3.695 average AAA reported last weekend.

In Nebraska, Iowa, and Wisconsin, prices are down about 3 cents over the last week. In Kentucky, Minnesota, and Texas, the average gas price has declined by about 2 cents. The price cuts in Colorado, Tennessee, Missouri, Kansas, and South Carolina total about 1 cent or less.

Meanwhile, statewide averages are up by at least 10 cents in 12 states. In Hawaii and Utah, AAA data shows prices are up by more than 20 cents a gallon since last Sunday. Utah has seen prices increase the most since March 1. According to AAA, the statewide average for a gallon of gasoline has jumped by more than $1.45 since the month began, from $2.741 to $4.197.

In total, gas prices have risen $1 or more in 23 states since the month began. "Nothing weighs more heavily on consumers’ collective psyche than having to pay more at the pump," wrote Mark Zandi, chief economist at Moody’s Analytics, and his colleagues in a commentary.

The Trump administration has considered ways to keep gas prices from reaching historic heights. Last week, the Environmental Protection Agency said it was temporarily allowing widespread sales of a higher ethanol gas blend in an attempt to tamp down consumer prices. E15 sales are typically discontinued in summer because it can contribute to harmful air pollution.