I have a 2010 KC.
Yep I've found I usually have close to 10 litres left when the light comes on. I continue to run mine down when the light is on and usually end up putting around 65 litres in before I get really scared. Think the most I've ever put in was 75 litres, filled it up until it was sitting just at the lip of the filler. (Think I got 640k's to the tank for that trip)
I work out my mileage with a pen and paper and get high 11's low 12's, which ties in with the distance travelled as displayed by the speedo travel thingy.
If I put on the OBDII and Torque, that tells me I'm averaging 7's which would mean I'd be getting 700+ k's per tank which I know I don't get.
14's is toooo high. Replace your air filter, pump up your tyres, take out all the crap, accelerate and brake gently, sit on 95 and not 100. Do that for a few tankfuls and see if it changes.
I've had 2 transfer case seals replaced in 50,000 k's. That's definately warranty.
Bluetooth should work, warranty again.
Door seals shouldn't perish, warranty.
Good luck.