the US uses up 20mill. barrels per day. If more efficient
mileage regulations were required for vehicles (and required SUVs to meet the same standards as cars) it would save a million barrels a day.
(btw - the Bush administration actually opposes more efficient mileage regulations, and US automakers dont consider that a high priority - as opposed to luxury options)

(More efficient standards would more than offset any oil taken out of ANWR which is only estimated to be 6billion barrels)

in 20 years the US will probably use 30mill barrels per day,
and with China hunger for oil growing so rapidly, one wonders where youre going to find more. Youre going to need a lot more ANWRs.