With gas prices climbing amid tensions in the Middle East (averaging $4.50 a gallon according to AAA , up more than 50% since the start of the war with Iran), President Donald Trump says he wants to suspend the federal gas tax “for a period of time” to help drivers. But some economists say the policy would likely have only a limited effect, since gasoline prices are driven mainly by global oil markets rather than federal taxes. What's a driver to do as we head toward the Memorial Day holiday? Read on. From just $107.88 $24.99 for Kiplinger Personal Finance Become a smarter, better informed investor. Subscribe from just $107.88 $24.99, plus get up to 4 Special Issues CLICK FOR FREE ISSUE Sign up for Kiplinger’s Free Newsletters Profit and prosper with the best of expert advice on investing, taxes, retirement, personal finance and more - straight to your e-mail. Profit and prosper with the best of expert advice - straight to your e-mail.…