LONDON (Reuters) - A blistering four-year rally in crude oil shows no sign yet of running out of steam and crude could top $80 a barrel this year, boosting fuel costs for consumers and businesses, analysts said on Tuesday. London's Brent crude hit an all-time high of $72.20 a barrel on Tuesday and U.S. crude oil hit a record $70.88, on concern that Iran's nuclear standoff with the West could cut oil exports from the world's fourth largest exporter. "Under the wrong circumstances, you could easily see $80 being broken or even higher than that," said Kevin Norrish, an analyst...