San Antonio Express-News: In the end, San Antonio-based refiners Valero and Tesoro didn’t have enough octane to overcome foes of a California proposition they backed. Voters on Tuesday overwhelmingly rejected a measure that would have suspended a climate-change law until the state’s jobless numbers drop by more than half. Valero Energy Corp. and Tesoro Corp., together with smaller contributors, spent about $10 million in a bid to persuade voters to approve Proposition 23, but opponents of the measure amassed a war chest…