hi
i have two. can be noisy, mainly transmission noise, but my 67 is quiet and smooth. the 66 is a bit worse but a lovely smooth engine. 70 is possible but as fuel consumption rises pretty much as a cube function of speed keep it to 50-55.the aerodynamics are like a garden shed. fitting the spare wheel on the bonnet does improve this marginally. CD of abou 0.43 i believe.
it is what it is.