Not a lot of mechanical differences AFAIK. 2017 models got a "judder damper" to, um, dampen some judder I suppose.I test road both gs and gsa yesterday. Found GSA gave more protection from wind and it seemed to be more planted on the pavement. Just wanted to know what the main difference between buying a 2015-2016 vs a 2018. I’m thinking of saving the depreciation for used 2016 and buy an extended warranty...pros and cons?
Possibly of interest is the big TFT screen introduced with the 2017 models. The console on the earlier models is kinda crap (IMO), hard to see in sun glare, whether the sun is in your face or shining on the console. I believe a lot of people, myself included, use their NAV V / VI GPS more as an info display than as a GPS (and use their phones as GPS) since it is easier to see vs. the console.
2018 models also have the emergency SOS call button feature.