Clutch Habits (Auto trans drivers plz don't vote)

Completely Incorrect

1.Engine vacuum is a product of the engine pulling air in, and the throttle plate restricting it. The only time vacuum is lost is under large throttle openings.
2.Shutting the truck off does not lead to a loss of brakes or vacuum if you leave the truck in gear, (try it).
3. Scangauge says the injector pulse is shortened at mid to high rpms, injectors off completly, much of the time below 2000 rpm....

According to Paul Williamsen, the product education manager at Toyota, “All contemporary Toyota and Lexus vehicles (and every other car built since the 1990s that I’ve looked at) can detect the condition when engine revs are higher than idle with a fully closed throttle: Under these conditions, all current to the fuel injectors is stopped, and no fuel is injected.” That means if your foot is off the gas while the car’s in gear, you’re not using any fuel.

 

Number 3 method. To save gas as Isthatahemi has explained why. I never understand why someone would downshift through all the gears when coming to a stop light. No matter how good you are at rev matching, its impossible to get it exact, thereby wearing the clutch.
I do rev match when I need to downshift, but certainly not when I know I will be stopping. Even in fifth you can get slowed down fairly well before lugging and needing to clutch. Then the brake effort to stop is minimal. Brake pads are cheaper and much easier to replace than a clutch. Coasting in gear uses no fuel whereby idling using about 0.3 gal/hr in my 4 cylinder.

Something no one has mentioned is that coasting in gear is actually beneficial in that the high vacuum condition pulls minute amounts of oil into the upper cylinder head region for added lubrication.

 

I'm the downshift kinda guy. It's always good to be ready to move at any time.

 

I voted for option 3, but what I usually do is put it in neutral and coast. Then, judging by the speed, if the light turns green, I put it back in gear and take off.