I have a 2009 S8, well it's my wife's and mine is a grandvista 250. Me and the wife just did 130 miles today and the temps were 92 degrees. She ran great all day. I run 50 weight oil thru the summer for the higher temps. You will find that taking breaks are nice. We go about 20-30 miles at a time. The seat design could be improved on to help out.
I bought my super 8 used for the wife to learn on with 4500 miles on it. I changed all the fluids when I got it and put full synthetic in the oil and gear lube, new air filter and spark plug and she runs like a dream. Maintenance is simple and cheap, which is y we invested in scooters instead if motorcycles. As long as u keep up with the maintenance you'll have now problems. Oil changes are key especially since there is no oil filter.
Also it only cost us $10 in fuel for 2 scoots on 130 miles!