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no worries colo, but to answer your first reply question yes, i double clutch down shift to first every single time i come to a complete stop. i dont do it BECAUSE im going to make a complete stop, i do it because my speed dictates the gear i should be in. i rarely if ever just leave the car in neutral, its in gear 99% of the time. even still, its not even thought about or practiced at this point its just the way i drive. i cant help it.
Fuel:
Mosc nailed this one. shifting out of gear at any reasonable speed is going to scare the computer and probably start adding fuel.
clutch:
double clutch downshfting does not use the clutch. so there is no wear, as long as your doing it right. (thats why we rev match, to do the clutches job for it, remember?) your still using the peddle, and actuating the clutch but but the clutch disk is not really 'doing' anything.
drivetrain:
just think about that one for a second. your blipping the throttle to ~3-4K. where do you shift under hard acceleration? 6-7K. no wear there. no-throttle load on the trans as your coasting is not more wear then hard acceleration. however, as stated above it is LESS wear then removing all load from a spinning trans.
brakes:
you might get pads for free but there is a bunch of other stuff that is used every time you apply them. and having them do all the work puts wear on all those components. for a frame of reference, im at 33K miles on my original pads and components.
shockloading:
ive never even heard the term tbqh. but, the trans does not spin free like a bearing. there is fluid in there and the components are not super heavy. so even if you pulled out of gear at 45mph and used brakes only to a complete stop under normal driving conditions, chances are the trans is back to its idle speed. however, if during your braking you realized the semi truck behind you is not going to stop in time you might have issues getting back into an appropriate gear quickly without an adequate blip.
dumping the clutch puts stupid amounts of shock on the trans. this is not your neighbors civic, the grip provided by 4 good size tires is not to be trifled with. its pointless anyway as its just going to bog the whimpy 230hp anyway.
essentially what it comes down to is the car is designed to be in gear. its always better to be in gear, weather you accelerating, coasting, or braking. that means no neutral, and only having the clutch engaged for more then a few seconds unless at a complete stop.
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