Regarding the roaring issue... What condition are your rear tyres in? The reason I'm asking is that I experienced a similar issue and upon further inspection on of my rear tyres was out of shape witch was coursing a lot of road noise inside the van making me think it was wheel bearings!!! Can't help with fuel gauge issue, but I'm thinking of a sticking sensor!!!!
Chrysler grand voyager 1998 3.3 LE.
86874 miles on the clock with no real problems to mention..
2001 Peugeot 307 (petrol) 46039 miles on the clock.