http://FremontMazda.com 866-427-0551 The 2011 Mazda 3i comes with a 2.0-liter inline-4 that produces 148 horsepower and 135 pound-feet of torque. A five-speed manual is standard, while a five-speed automatic is optional on all but the 3i SV. Estimated fuel economy is 24 mpg city/33 mpg highway and 27 mpg combined with the automatic - the manual stands at 25/33/28. The Mazda 3s is powered by a 2.5-liter inline-4 good for 167 hp and 168 lb-ft of torque. A six-speed manual is standard here, with a five-speed automatic optional. In performance testing, a manual-equipped 3s went from zero to 60 mph in 8.1 seconds. Estimated fuel economy is 22 mpg city/29 mpg highway and 25 mpg combined with the automatic (20/28/23 with the manual).