My intial review of the 2012 Chevrolet Sonic was less than stellar. Considerably less. But, as noted, that reviewed covered the LT trim level with the normally-aspirated 1.8-liter four-cylinder engine and six-speed automatic transmission. Everyone else (aside from our own Steve Lang) has been reviewing the LTZ trim level with the 1.4-liter turbocharged four and six-speed manual transmission. They’ve been much more positive about the car. How much difference can an engine, transmission, and tires make?