Tyre size make and type make the world of difference, and its possible to add additional soundproofing quite cheaply and easily for a reasonable DIYer, you'd be surpirsed what £50 worth of 10/12mm self adhesive insulation pads will do, beware though soundproofing can be addictive, next you'll find yourself remove the door cards and trimming in 8mm thick pads on the inner door skins :-)
A few duvets placed around the car, starting near the rear wheel arches, will help you eliminate the noise sources as it quietes down, engine noise means some contortions trying to infill lacking soundproofing around the bulkhead and front wheelarches behind those side trims in the footwell, it might need some additional bonnet insulation but that's got to be fireproof obviously.
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