You can save 50KG by only putting 3 Gallons of fuel in. So if you buy a Cup and brim the tank then you'll then be around 4KG heavier than a FF with a third of a tank.
On a track car, or a race car, 46KG is a good chunk to save, no doubting that. But on a road car it's negligible I think, I certainly don't think a Cup would be night and day faster than a FF in a straight line nor would it brake noticeably better as a result either.
On a track car, or a race car, 46KG is a good chunk to save, no doubting that. But on a road car it's negligible I think, I certainly don't think a Cup would be night and day faster than a FF in a straight line nor would it brake noticeably better as a result either.