i believe if you want 35" tires, you would need a minimal of 2.5 inches raised if you dont want any rubbing
i have bilstiens 6112 and its raised about 2.25 with 295 60 20 +15 offset, so its about a 34" tire and it barely clears it.
your off set is going to be your main factor to the rub
to me base on my set up since i have a deck system loaded up with tools
eco for most stock feel and save gas
when i want instant throttle response i like city 2+
When you buy a 295 tire you have to expect some type of noise, some brand of tires are louder than others.
There are alot of other factors also for MPG.
Depending on your location, Winter gasoline is used and that may drop a little mpg.
The powerboost is electric so cold weather is not the most...
i have the same car, at stock it rides like my mercedes GLS. Now that i upgraded to bilsteins 6112 and 5140 rear with hellwig sway bar, it drives like a sports car