The PY-VPR and PY-VPS were 2.5-litre petrol engines offered with and without Mazda's 'i-ELOOP' brake energy regeneration system, respectively. Marketed under the 'SkyActiv-G' label, the PY-VPS engine was introduced in the Mazda KE CX-5 and subsequently powered the GJ Mazda6. From 2013, the PY-VPS engine powered the BM Mazda3 SP25.
Turbos are always a trade-off. 1) you get more power, and possibly better mileage if you don't use the turbo a lot. (i.e. a 4-cyl turbo instead of a 6-cyl NA engine.) 2) you get more heat, pressure and complexity in trade. Heat and pressure are the enemies of combustion engines, so you figure it out.
The Skyactiv engines have significantly higher compression than average (13:1). Part of the way that is achieved is through the use of special rings. Mine has 116,000 miles on it and I have been using 0W-20 for the entire time. I was going 30,000 miles between oil changes when microGreen filters were still available.. 60 180 605 868 121 248 398 81