I know, I know. You were all set to buy the 2012 SL63, but the mpg numbers scared you off. Take heart, Mr. Gas Miser, because the 2013 Mercedes-Benz SL63 AMG is about to be unveiled at the 2012 Geneva Motor Show, and its bringing everything you’d want in a new AMG model. The M157 engine is a twin-turbocharged 5.5-liter V-8 designed to crank out 530 hp and 590 lb-ft of torque. Expect to go 0 to 60 mph in a hyper quick 4.2 seconds, though the top speed is electronically maxed out at 155 mph. Oh, and about that mileage; Mercedes says the new engine and other additions make the 2013 SL63 AMG about 30 percent more fuel-efficient than last year’s model, which eked out EPA ratings of 12/19 mpg city/highway. There. Now you can seal the deal.