Your right nothing beats bombing along in a mini thinking your doing mach 1, but you look down at the speedo it says 40mph!
It's a case I think that modern cars are just more capable of cruising at higher speeds without feeling that the car is falling to pieces around you.
Also generally (& I mean very generally) as you get older you buy larger &/or newer cars. When you passed your test you bought a £500 jalopy that was a death trap could just manage 80mph with a tail wind. But as you get older & better paid you progress to slightly larger newer better built cars till you reach the point, where you have a family & now you have a Mondeo that will cruise happily all day at 100mph (120mph when the wife's asleep).
Seating position is a good one too. Take MPV's, they have high van like seating positions that lower the sense of speed on the road, just try taking a Westfield or Caterham out on the motorway & see how that feels! Lorries seem really, really big too
