Hi I have just fitted a full set of 185.55.16 Goodyear efficentgrip. So far (I have only done a small mileage due to lockdown) the ride is no worse even though they are slightly lower profile, mpg seems about the same, (it dosnt like this cold wet weather) and has recently dropped from 68.8mpg to around 65, but probably due to aircon to counter the damp, The ride is not so harsh, bumps are still felt but feel a bit smoother, it dosnt appear any quieter even though they are lower db rating than the horrid bridgestones. They were quite a bit cheaper, and easier to get. I had hoped for the XL version which is even higher rated, but ended up with 'performance' which is b rather than a for economy. I doubt whether anyone other than a German test company could tell the difference. The good news is there is a wide choice in this size and it is only 1% smaller than 175's, so you can pick your favorites. Hope this helps. Ps I am running standard pressure at mo, but may experiment when L.D. ends Cheers Colin