QUOTE(huzaifa136 @ May 22 2012, 06:33 PM)
it's all about ur right foot? right? gently or manly
if u based on vacuum meter.
but high rpm = full throttle (*usually)
V12k got the point, all those stuff take into account. BUT, what I'm trying to emphasize is, the ONLY factor you can change WHILST driving is your right foot behaviour. You may have 0.03(probably can never achieve, unless you're using DUREX) wind drag aerodynamic bodykit, you may be doing downhill, may be its dry weather + 800 thread wear tarmac tyre on fine road, at the same time rolling with high grade ENDURO CERAMIC bearings, but if your right foot is stepping on 0in/hg vacuum... whats the point to have all that fuel saving stuff on your car?

So, when you're driving, you cant change tyre at the same time, you lift your right foot to save fuel. When you driving, you can't change bodykit, you lift your right foot to save fuel. When you're uphill, you choose to let loose a little of your right foot, allow cruising speed drop instead of stepping steeper to maintain 120kmh uphill. When you're using the normal 5km distance junk road to go office daily, you can't possibly use NKVE travel another 30km to go to work, instead you pick the right speed to drive through the rough 5km.
QUOTE(lhwj @ May 22 2012, 06:53 PM)
True for manual for sure. Because while coasting downhill in gear without stepping on any pedals, if I step on the accelerator I can feel the engine come back to life (start running on its own again). I turn to my friends then and tell them I'm using zero fuel at the moment

That's why I always hantam those people who tell me they coast downhill in neutral

(unless their car has carburettor)
What about CVT and 4 speed auto?
Be it carburator/EFI/auto/manual/CVT/Diesel, the air/fuel mixture will automatically become lean when throttle body closed.
In conventional carburator(not talking about racing carbs), there are 3 jet inside the inlet.
Idling jet = to supply minimal fuel to maintain idling air/fuel so engine wont stall
Fuel jet = supply fuel for sprint/drive
Air jet = to mix with fuel
Different type of EFI engines got mass flow sensors.
Performance cars normally has it OUTSIDE throttle body, nearer to air filter to get the CORRECT amount of air intake and to supply CORRECT amount of fuel to achieve motorsports performance
Normal family cars has it INSIDE the throttle body or manifold. Less dirty/less response
Diesel engines, when throttle open, AC pump pour diesel inside, piston "giap" the air/fuel until the mixture canot tahan, then explode(combustion)

Throttle body closed, AC pump pour nothing into the engine. Piston "giap" the air, no fuel to ignite.
Manual or auto, RPM doesn't really matter when down hill. Just beware of OVER DRAGGED of long running lean(more air VS less fuel mixture) that causes overheating to the head gasket.
Added on May 22, 2012, 8:41 pmQUOTE(ogkhojack @ May 22 2012, 08:22 PM)
if its there, i wont ask here
May be they accidently TERpasang the traction control into your ride

The light will only lite on when the traction control activated, which mean you're having wheel spin that time. You may try a gain to purposely go through a puddle and step on the accelerator 9 9
This post has been edited by davidke20: May 22 2012, 08:41 PM