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ExxonMobil Corp. boosted its proven reserves in 2008 by 1.5 billion boe, more than replacing the amount of oil and natural gas it produced. The Irving, TX-based major said reserves added totaled 103% of the resources it produced last year. ExxonMobil had 22.8 billion boe of reserves at year-end 2008, split evenly between natural gas and oil. Excluding asset sales, the producer replaced 110% of its output. Using the Dec. 31, 2008 oil and gas prices required by the Securities and Exchange Commission to make reserves calculations, ExxonMobil replaced 136% of its output, the company said. Prices from a single day, it said, are not useful for making long-term investment decisions. At the end of 2008, ExxonMobil’s proved reserves base increased to 22.8 billion boe. The company’s reserves life, at current production rates, is 15.3 years. The portion of proved reserves already developed was estimated at 62%.