I saw 110mph in my '86 Uno FIRE only a couple of months back! Northbound on the M40, near the Prices Risburough turn off. HUGE and very long down hill stretch, and without realising it I was touching the mid 90's a third of the way down, so I thought what the hell, foot to the floor and see what it would do.
Touched 110mph before I hit the bottom, at which point it went up hill a bit and the speed dropped back to just below 100mph.
Weirdest thing I find with the FIRE Uno's, is that they will struggle to go much over 80mph on the flat, but if you can get them to 90 or even 100 down hill, they seem to be able to hold that speed once on the flat again
I must also add that it suffered no ill effects or overheating, in fact the temperature gauge was sitting at a very normal 80 degrees.
Of course, who knows how accurate the speedo reading actually was (it was quite steady with no wavering though), and also getting up to speed on the flat is the 'real' top speed. Any vehicle can read much higher on a down hill stretch.
I also suspect as well that the FIRE engines can go a lot faster down hill, as certainly in the case of the Uno, 5th gear is very high. Even at over 100mph the engine is revving around 5000rpm - not anywhere near the redline.
There's a picture I have somewhere of a slightly modified FIRE mk1 Uno showing 200kph on the clocks (124mph!)
It was running twin two barrel carburetors though
Oh, and Acid_Burn, were you talking about a similar long down hill stretch on the M25 just before the M23 turn off? I know it well! Going the opposite way on that stretch of the M25, my Uno will struggle to hold 65mph before getting to the top. It's a very steep hill...
