“My point to His Majesty is going to be, when consumers have less purchasing power because of high prices of gasoline — in other words, when it affects their families, it could cause this economy to slow down,” the president said in an expansive interview summarizing his eight-day trip to the Middle East.

“If the economy slows down, there will be less barrels of oil purchased.” It was unclear whether Mr. Bush’s entreaties alone would have any significant effect on the price of oil, because, as the president acknowledged, demand continues to rise faster than supplies, especially in expanding markets in China and India, as well as the United States.

Neither King Abdullah nor Mr. Bush discussed the matter publicly as they met for dinner inside a tentlike hall on Tuesday night, chatting instead about the unusually cold weather. But Saudi Arabia’s oil minister, Ali al-Naimi, appeared to rebuff the president’s appeal earlier in the day.

Saudi Arabia, he said, shared the president’s concern that a downturn in the American economy could have profound effects around the world, including on the oil market. He even raised the prospect of “recession,” a word Mr. Bush studiously avoided in the interview, even when pressed about “the R-word.” But Mr. Naimi said Saudi Arabia would raise production only “when the market justifies it.”