Last time CAFE standards were improved was April 2003. Source
While I am anything BUT an apologist for Bush, I will give him props for butting heads with Congress:
"Bush supports drilling in Alaska, which the House approved last night, as well as incentives and tax breaks aimed at promoting cleaner-burning coal, nuclear energy, liquefied natural gas, ethanol and other renewable fuels. He does not support the amount of tax breaks for oil and gas exploration proposed by House Republicans." Source
I do not support the drilling of ANWR. I do support alternative fuel research and increased CAFE standards.