Overall, 71 percent said rising prices would cause some hardship for them and their families, including 41 percent who called it a "serious" hardship. Just 29 percent said rising prices were not causing a negative impact on their finances.
While those with household incomes under $50,000 were already feeling strained in March, according to a poll that month, the new survey shows financial pain is increasingly spreading to those with higher incomes. Among those with annual household incomes of more than $50,000, 63 percent say rising prices are causing them financial hardship, up from 55 percent in March.
For older Americans, it's worse.
The share of seniors expressing financial hardship over gas prices hit 76 percent; it was 68 percent in March.
Nettie Cash, 65, of Dallas, Ga., is cutting back on her medicine because of the cost of fueling up her Buick. Cash is still taking her heart pills but is forgoing her inhaler and ulcer medicine for now.
"It's not easy," she said. "You have to do what you have to do."
Since January, gas prices are up about 90 cents, with the national average for a gallon of regular this week at $3.96.
Financial analyst Nicole Polite in Baltimore sold her Nissan Altima recently and is taking public transit. Gas prices were just too high, she says, so she and her boyfriend downsized to a one-car household.
"It's definitely a financial strain because now you have to reassess everything," said Polite, 32. "We don't go out as much. That $20 that we could have used to go to a movie - now that money has been absorbed by the gas tank."
Analysts say relief is coming. Fred Rozell, retail pricing director at the Oil Price Information Service, expects the price at the pump to drop as much as 40 cents in the next four weeks. In the Philadelphia area, the average price fell 7 cents a gallon in the last week, AAA Mid-Atlantic reported Friday.
Ross Cobb in Boerne, Texas, will still try to keep his highway miles down.
"We coordinate all of our trips into San Antonio," said Cobb, an associate athletic director at the University of Texas at San Antonio. "We don't ever go in anymore just for one particular errand. We wait until we've got two or three things to do."
The Associated Press-GfK Poll was conducted by GfK Roper Public Affairs & Corporate Communications. It involved landline and cellphone interviews with 1,001 adults nationwide and has a margin of sampling error of plus or minus 4.2 percentage points.
The Pinch at the Pump
Three of the questions about the effect of rising gas prices.
Have you reduced your amount of driving?
Yes 66 percent
No 34 percent
Have you changed plans to vacation closer to home?
Yes 48 percent
No 51 percent
Don't know 1 percent
Have you cut other expenses?
Yes 72 percent
No 28 percent
SOURCE: Associated Press/GfK