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Карнавал
Right now you should take 5pcs TDs, and buy them a legendary in big4.
This will give a boost in tempo of about 0.075sec. A permanent advantage - so u win Q, and with a higher place in the quals and a higher tempo, you can save KERS. Almost p2w already.
Fuel is bullshit - spreadsheets will solve the problem, without buying TDs
Where this 0.075 comes from?
I assume he's coming to a conclussion that each extra point in the main 4 attributes contribute to a 0,005 because he said 5 TD with skill in those in legendary (3 pts per TD, so... 3 x 5 = 15 x 0,005 = 0,075.
That would be the only mathematical explanation to his reasoning.
A different story is what those points actually contribute to.
First,... If the attribute upgraded is more or less relevant to a circuit.
Second: It's not the same to add +15 points early season than doing so when you have almost everything maxed our. And also to factor the First principle.
Then it's the relevancy depending on your rivals' development, and last buy not least it's if you nailed a setup for a race or didn't.
So no, 0,075 it's only in his mind. Those points might be as much as 0,2 secs early season or 0,001 late season. As it happens with engine points aswell.
These would help, but sometimes information is more important, so I don't know about his recommendation. 15 fixed points vs. getting the information skills.
Your choice.