I'm pretty sure that 190 hp to wheels for the 2.0 is a mistake. The Miata ND skyactiv 2.0 has a more performance oriented exhaust cam, and cannot achieve more than 165 wheel hp since there is some kind of limitation for these engines (Goodwin/OV Tuning is working on this). ~190 hp at the crank is what you can expect for a 3 gallon E85 (94-95 octane) OV tune on the skyactiv 2.0.
Are u sure? Because base on the 91+ for 2.0L can reach nearly 185-190. So what's the point to upgrade to E85? I mean the HP and Torque are same with 91....
With 91 octane on a 3rd gen Mazda 3 2.0, the tune gives you ~155 wheel horsepower based on the dyno results. If you go up 3-4 octane points with a 91 octane & 3 gallon E85 mix, its safe to say you will get another ~10 whp. Not 30-35 more whp/tq... There is also a limitation on these engines. They gain mostly more in the mid-range, but the top-end is limited by another factor. This thread has links and an explanation of this limitation for the 2.0 (post 7 and 17)
Saying minimal MPG change and maximum performance is sounding flawed until you define maximum performance. If the engine is limited then yes, you've reached maximum. The words sounds more imprewssive than the actual changes. Nitrous on demand at 3000rpm...