Copied from my old post:
Okay, so I got sick of not being able to answer inquiries about FUEL... so I spent several hours with it yesterday... I'm only a few hours in so this is a little provisional, but I doubt more time would change what I have to say.
Fuel is not a bad racing game. It has a fairly standard arcade physics model. Racing includes dirt bikes, quads, cars (and possibly more). There are two bits that are fairly unique to Fuel. (1) Most races are checkpoint races, but there is no set path you have to stay on, you can take any path you choose. Which leads to (2) there seems to be three basic types of surfaces you can drive on: asphalt, trail, & wilderness. Different vehicles are better (faster is seems) on different surfaces, driving through wilderness is definitely speed-penalized. This means that it's up to you to choose how much to shortcut though wilderness and how much to stay on road/trail. I like this mechanic.
Open World: Yes it seems to be huge open world (without a much variation in the areas I've been to). However getting across the open world is slow and uninteresting. Fortunately you don't have to, races & challenges are all menu accessible (enter and leave a race to shortcut across the map). There seem to be discoverable stuff like liveries in the open world bit. I however believe atm that the open world bit is best skipped, if there were vehicles/performance parts I could put up with it. I now understand why some optional parts of the Refueled mod seem to be cheat-like discoverable unlocks... I'd be tempted... I hate cheating, but if the alternative is sh*t it's on the table.
Technically: Well it's based on some engine I've never seen before. Technically the graphics are okay, not deplorable, not likeable. 4x MSAA doesn't help with aliasing as much as it should (but it does affect performance), I turned off in-game AA and used SweetFX to add in SMAA to my satisfaction. I'm running at 1920x1200 on a Phenom II X3 720 BE OC'd at 3.2 GHz and an OC'd GTX 660 (overkill for any 2009 game). While my framerate is acceptable, it sometime dips to the low 50s without being at 100% CPU or GPU load (I never seem to hit 100% CPU or GPU load in Fuel).
Other tips: You can try any Career race at three difficulty levels: LOL, Seriously?!?, and Putting up a Fight, each level rewards more fuel (currency). "Challenges" are races in different formats that don't have a difficulty selection but aren't any more challenging... but they reward a nice amount of fuel.. don't pass them up.
TL;DR Decent arcade racer. Avoid the open world abyss.
Edit: I'd also add that I'm tempted to try some SweetFX filters to spice up the visuals... I'm not generally a fan of such filters.. but it might give Fuel some needed visual pop.
Edit2: SecuROM + GFWL fyi.