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I have just skimmed a road test report that claimed the car is exceptionally quiet on the road...
By now the tyres might have been changed from the original specification - some tyres are very noisy and assuming the wheel bearings, etc. are ok the tyres are the most likely culprit. SUV tyres are expensive and good ones are very expensive so maybe the tyres are now not such high quality or are off-road or combination tyres rather than road tyres...
That is something to check and if it isn't a matching set of four, that can increase noise too. Ensuring the wheel alignment is correct is important for smooth and quiet running and of course the tyre pressures must also be correct.
Check the door seals and ensure all the doors and tailgate fit properly and are correctly adjusted and ensure all the body plugs are fitted and similarly any grommets and gaiters.
unlikely--- humming noise is from a vibration caused by failing drive line joints , bearing failures, out of balance drive shafts , failing rear engine mounts, worn slip joints, worn output shaft bush in the transmission housing
it can also be from bad tyres or tyres with a regular tyre pattern in the tread
To understand this you have to closely inspect the tread pattern of tyres and you will see that the pattern is not consistent around the tyre as that consistency is what gives a noise ( example is the old bar tread tyre and the road hum that was produced on hard surface roads)
New cars have rubber sunspension bushes that absorbe a lot of road noise. Check to see if someone hasn't replaced the suspension points with neoprene bushing. This is a hard plastic that will not absorb the road noise. The other part of your problem will be the tread pattern of the tyres as they are designed for off road use but will howl on sealed surfaces. Experiment with tyre pressures as a few pound up or down may make a difference. Talk to a tyre dealer for advice on this
It depends on the tires you use and on the driving terrain.
If you use the original P225/75R15 the recommended pressure is at at 29 psi front 32 psi rear.
If you mount good 30X/9.5/15, you can keep them at 35psi for on road. Lower to 32 if you want softer tires. If you drive mainly off road or you have to drive a particularly bad terrain you can lower the pressure to about 29 psi or even 20 for desert sand or mud.
tyre noise depends on the tread pattern/road surface material.so it is a bad tyre depot that cannot tell you which are quiter than other makes,same as ones that last longest. most customers buy the cheapest they can get and complain about the car...)any block pattern tyre will be noisy(look at the tread pattern on a limo)the only way you can be sure of getting a quiter ride is to email the maker direct.BUT be warned you may pay 3--4 times the price of a "standard tyre" and any suv is no limo......no block pattern, no grip in mud/snow....
Without being there, it is hard to say. You need to consider tire condition - large mud tires are noisy; tires over inflated will be noisy; a bad driveline u-joint will make noise; drive line bearings, wheel bearings all could be a factor. have a mechanic friend ride with you and help pinpoint the cause.