Ive read/heard somewhere that weigh bridges arent accurate for weighing cars - this is due to the suspension/wheels pushing out the weighing stalls/stands onto the sides of the walls thus giving a strange reading. Ill try and find it again soon and tell yall. In order to get accuracy you have to weigh the car at each corner (or something). It doesnt really matter with trucks which is what the weighbridges were intended for.
The reason us mk.1 172s are wondering about the weight is because of these factors: the mk.2 has closer gearing and induction tract (why would they change these if the difference in weight was only 21 kg?), all the extra stuff that the mk.2 has: climate control, larger wheels (more metal must weigh more!), different/higher-grade interior plastics, those fancy gas discharge lights are supposed to be quite heavy, different body panels including front light washers, rain sensing wipers, stiffer chasis revisions?. Surely all those things would add up to more than 21 kg? or maybe im just not being realistic.
So if seats, windscreen, air con, abs, blue lights, spare wheel adds up to 89 kg then all the stuff the mk.2 172 (normal) has over the mk.1 can add up to 75kg? (hmmm, im wondering about that....75 is a lot actually)
I wonder if theres a more accurate way of weighing the cars?
But if you look at the stats, the mk.1 was timed at 6.5 to 60 by the mags some said 6.6 top gear even said 7.1 then 6.9. The CUP is timed at 6.5, 6.8, 6.9 ive seen. But with its shorter gears accelerates to 100 quicker than the mk.1 because not only is it lighter, but it has those special gears and the different torque curve. Thats why the CUP is the quickest.
I need to get me a mk.2 gearbox!
Its within the article of a "battle" between mk.1 172, 206 gti, proton gti and ford puma. Its an auto express one and the times are as follows: 
