Hyundai Problems

It's a course worth considering. Rapid brake wear, both pads and rotors, is not confined to Hyundai, many makes suffer from the same issue, it's a consequence of the demand for better braking efficiency. That said, I would expect rotors to last longer than that, which might give you a claim under the consumer laws. Going that way, however, will test your patience and persistence. It might be better to consult a brake specialist and fit rotors that might last longer.

If it's road noise you should be able to hear coming from the rear in a car like that. Insulating the floor and the rear wheel wells by applying sound deadening material should help. Look for a company that supplies automotive flooring and carpets etc., one like Trufit.
 

You'll find there's also a time requirement on the belt. Even though it's only done 37,000 km it is going on for seven years old, so I would always err on the side of caution and change the belt.

Carmakers don't make claims in km/litre terms, so I don't know who made the claim of 20 km/litre. The official claimed fuel consumptions for your car is 6.9 L/100 km, which makes it 14.5 km/litre if you convert it to your terms. The official figures come from a standard laboratory test that every carmaker does and they're meant to be purely for comparison purposes to allow you to compare car to car, model to model, they're not a real life measure of fuel consumption. You need to recheck your actual fuel consumption before you take it back to the dealer. That way you know what it really is, and you would have something meaningful you could discuss with them.

No, I don't, but I don't know how he could know that non-genuine fluid was used when last serviced. That said, auto transmissions do wear out and often need rebuilding. The cost would seem to be reasonable. It's certainly not a normal warranty issue.
 

Have the cooling system flushed, making sure the radiator is clean, and replace use quality coolant. Also check that the fan is actually working when it should be.
 

You need to have them inspect the master cylinder and the clutch to determine what the problem is. If it is a leaking master cylinder, and as a result the clutch has been contaminated by the leaking fluid then you have a legitimate claim, but you won't know until the clutch can be checked.

I doubt the caliper needs replacing, but a closer inspection is probably warranted. Accumulated brake dust was a reasonable assessment on the dealer's part, even though you couldn't see any dust on the outside. I'd inspect it again, blow out any dust found, and check for stones caught in the caliper.