FACTBOX: Presidential candidates on gas prices

(Reuters) - The White House said on Monday there are no quick fixes for U.S. gasoline prices that now average a record $3.60 per gallon, but those aiming to succeed President George W. Bush have proposed several solutions.

Following is a summary of their proposals:

DEMOCRATIC NEW YORK SEN. HILLARY CLINTON

- Suspend the 18.4-cent federal gasoline tax through the peak summer driving months. A windfall tax on energy companies would cover the revenue shortfall.

- Suspend filling the Strategic Petroleum Reserve for one year, freeing up more oil for the open market.

- Devote $150 billion to developing alternative energy.

- Raise royalties for oil companies that drill on public land.

- Increase fuel economy standards to 55 miles per gallon by 2030.

- Investigate market manipulation of oil prices.

DEMOCRATIC ILLINOIS SEN. BARACK OBAMA

- Double fuel economy standards to 50 miles per gallon by 2026.

- Devote $150 billion over 10 years to developing alternative energy.

- Does not support suspending the gas tax, saying oil companies would simply raise prices to make up the difference.

- Investigate market manipulation of oil prices.

REPUBLICAN ARIZONA SEN. JOHN MCCAIN

- Suspend the gas tax through the summer months.