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I meant eras generally, but I suppose I mean since these current fuel tanks rules (approximately). Sort of post Gp C (and a bit more) to when it settle down in the mid to late 90s! very vague!
As it seems the pit drill and reliability is top draw nowadays I guess the main chance that a previous 'era' or different class (as mentioned about) has is by having a larger fuel tank (or better consumption!).
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