BBR GTI offer various stages of tune/upgrade to get the Mazda 3 SkyActiv 2.0 up to 185 and (with the help of intake, header, exhaust, cams, etc) claim up to 200 HP for the NC Miata with the SkyActiv2.0.
Here's the thing about internal combustion engines: it's all about efficiency (and not necessarily fuel). It's about extracting the most amount of energy from a given quantity of fuel. You can tune that to use only a little fuel to make modest power or you can tune it to use more fuel to make more power. In American car culture, we often (though not always and less since oil prices spike a while back) buy horsepower so manufacturers have been taking their efficiency gains and turning the engines to make more power. More recently, as consumers have been freaking out about $4-$5 gallons of gasoline (and as CAFE standards have risen), manufacturers have been focusing improving fuel economy so we're seeing low/mid level consumer cars stagnate in the 100-200 HP range while fuel economy has rise.
The SkyActiv engines are heavily tuned for fuel economy but, at their hearts, they are high compression ratio engines (which usually means lots of power). With compression ratios that high, I could see making significant HP gains at the expense of fuel economy with a carefully written tune (changing spark/injector timing and dwell, valve timing, throttle response, redline etc). If you wanted to go crazy, a different cam shaft can help the engine breath better and lighter valves/crank/pistons would let you increase the redline for even more power.
Honda can get ~200 HP out of 2L at 11:1 compression ratio. Granted, that engine spins to 8k RPM but I'm sure there are some gains to be had with DI and the rest of Mazda's SkyActiv improvements.
