BONNERS FERRY, Idaho – Stu Grant was a bit wistful as he filled up the gas tank in his camper at an Exxon station 35 miles south of the Canadian border. "It's the last of the cheap gas," said Grant, who lives in Alberta. Grant and his pal, Ken Robertson, were on the final leg of a 3,000-mile road trip that took them to Monterey, Calif., to watch motorcycle races. On the way, they got used to American prices at the pump.