short answer 1.22 but....
Hi doug sorry for the delay, i am using a 1.22 trans box & 235x85x16 Kumo KL1's it toots along @ 65mph @2500 rpm however i dont get to 3000 rpm unless i'm in low.
it's great to drive and i love it however it shifts to 4th @ 52mph so spend much of my drive to and from work in 3rd, I'm going to swap it for a 1.4 when I find a good one.
fuel consumption is 25mpg consistant over the past year ( I drive 1100 miles per month ) and always check mpg, last months fuel bill was £300 for 1142 mls
best consumption was 33mpg cruising through france on way home from Bad K. show in germany.