I would be extremely careful with these figures, and what they might actually mean.
For example, the "J`s" produced as far as we can see had "F" superchargers on (I think), as the final "J" version superchargers
with variable speed drives were probably not ready. Its not easy to say what these numbers refer to.
The "F" had no chargecooler, so would have been a lot lighter.... so is tricky to say whats-what. In other words,
a "J" with the final supercharger, would probably be more comparable with an "E", weight wise.
Here is another set of numbers... dry weight. Note this states that the "weight tolerance" itself is about 30kg !
So dont get too fastidious about this stuff. (92kg of fluids of all forms)
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