Chevron Corp. has reported earnings of $4.55 billion ($2.27 per share – diluted) for the first quarter 2010, compared with $1.84 billion ($0.92 per share -diluted) in the 2009 first quarter. Results in the 2009 period included gains of approximately $400 million ($0.20 per share) from downstream asset sales. Foreign-currency effects reduced earnings in the…