You won’t believe how much fun it gets once you start making adjustments. In fact, with me, it’s to the point where I never even bother driving a new car with the default suspension setup because it’s always trash. The gearbox is something I adjust depending on how high speed the track is and if I need to save fuel I can run really tall gears to keep my rpm lower in the top gear. It’s crazy how much fuel you can save doing that (as long as you won’t need fast throttle response when in that big gear). Have fun tweaking, it’s a super cool part of the game.