Just did my first endurance at the Grand Valley 300km. If I had to do it over again, I would probably do it in a less powerful car, like the Corvette Race car. Of course I want to finish the race ASAP, cuz after 20 laps, I start to get tranced. The 89C is quite the handful even at TC5. I also started with racing hard. Generally speaking, the hard should be able to last a lot longer then softs. But not in this game. The amount of laps were about the same, but the softs were like 8 secs a lap faster, so there is no point in using hards on a powerful car i guess. Maybe a less, powerful car can use the hard better, idk. I was happy to see the exp points at like 113,000, if any less i would probably throw my controller, LOL.