Mine was certainly a giggle to drive, you had real turbo lag!
I could never get more than an average of 30 mpg out of it though, 1049cc and 85 BHP, although had mine on the rollers and it was 99 BHP when at the same time, Escort RS Turbos weren't making their stock 130!
Compare to my M140i 30 years later, a cylinder capacity 3 times bigger, output power 4 times greater, and an average of 35 mpg!