http://VictoryChevy.com 888-906-9328 The standard engine on the 2012 Chevy Sonic is a 1.8-liter inline-4 that makes 138 hp and 125 lb-ft of torque. LT and LTZ models are available with a turbocharged 1.4-liter inline-4 that generates 138 hp and 148 lb-ft of torque. A five-speed manual transmission is standard with the 1.8 liter, with a six-speed automatic available as an option. A six-speed manual transmission is standard with the turbocharged 1.4, and it's the only transmission available with this engine. EPA fuel economy estimates stand at 26 mpg city/35 mpg highway and 29 mpg combined for the 1.8-liter engine with the manual transmission, with the engine getting 25/35/28 with the automatic. Chevy's estimates place the turbocharged 1.4-liter at 29/40.