April 28 (UPI) — Average gas prices in the United States hit $4.18 on Tuesday, their highest level since the Iran conflict started, as peace talks between the country and Iran stalled again over proposals on reopening the Strait of Hormuz.

The price jump of 1.6% over Monday’s price was the highest increase in more than a month, The New York Times reported. AAA numbers show that the average price for a gallon of regular gas marks an increase from $4.11 on Monday and $3.98 a month ago.

The price is the highest since April 2022, soon after the Russia-Ukraine conflict started, and about a 40% increase for drivers since the Iran conflict began. Diesel prices are at $5.46, up about 45% in that time.

Meanwhile, officials from the United States and Iran appear at an impasse over reopening the strait and an Iranian proposal to postpone discussion of that country’s nuclear program, something that President Donald Trump has said he will not agree to, USA Today reported. The conflict, as of midday Tuesday, is in a ceasefire, but both countries continue to limit shipping in the region and face off over the Strait of Hormuz.

Trump on Tuesday posted on Truth Social in an apparent response to German Chancellor Friedrich Merz’s comments Monday criticizing the conflict. Merz said in comments to students that he hopes the conflict ends soon and that United States is being “humiliated” by Iranian leaders, USA Today reported.

“He doesn’t know what he’s talking about!” Trump wrote. “If Iran had a Nuclear Weapon, the whole World would be held hostage. I am doing something with Iran, right now, that other Nations, or Presidents, should have done long ago.”