I'd plan for 80 KIAS on cross country flights. Yes, 90 is doable with two people but your fuel burn will increase (80 KIAS is best range speed) and the vibrations/wind noise will increase as well. With the cyclic trimmed well the G2 is a very comfortable and easy aircraft to fly cross country. Not sure what the passenger/luggage weight is going to be for you but 2.5 hours of flight time shouldn't be much of a problem. A full tank would give you a little over 4 hours.
30 kts of winds I wouldn't recommend either. Especially at the private level and flying for pleasure, there is really no need to push the limits. It is definitely doable but requires very proactive pedal work, as well as some snug seatbelts as you will get kicked around quite a bit.
With component wear, I don't see an issue as long as you stay out of the yellow range in cruise. If you pull into the yellow in cruise the component that will start to wear is the TGB. But again, we don't usually push our G2s to 90 KIAS for extended periods of time because of ride comfort and fuel burn.