Consumers may face high prices at gas pumps as unrest in Libya boosted crude oil prices by about 4 percent Monday.The U.S. markets were closed in honor of Presidents Day, but prices for a benchmark crude in Europe were up $3.10 a barrel, to $92.90.Gas prices are already up about 50 cents, year-over-year.The average price of a gallon of regular unleaded gasoline in the Tampa-St. Petersburg-Clearwater market was $3.09 Monday, up from $3.07 a week earlier and $2.61 a year earlier, AAA reported.While Egypt, Bahrain and Yemen, the sites of other protests, are not major oil producers, Libya is, which is why markets are...