Thank you Salmo. Very interesting. I have to admit on my car 1 st is quite a challenge as when really trying you get to 6000 rpm what feels like almost instantly. The other gears are fine, giving a lively performance. 5th is useable at 40mph and at 70mph indicates only an extra 300 rpm from the original 3.73 diff. The car is also shod with 275/70/R15 which I guess make a small difference too.
Imho just goes to show how each car can be made to suit the driver. All part of the fun of ownership.
4/4 Ivory 4.1:1 axle, Jaguar XE R-Sport.