I've read that excessive use of brakes down slopes e.g. from Damn-e-Koh in Islamabad cause extra brake wear but if I use lower gears to decelerate along with some amount of braking, what affect would that have on the following two things:
1. Fuel consumption (even though I'm not pressing the accelerator)
2. Engine wear and tear due to higher RPMs
I read somewhere that some cars are equipped with a feature called DFCO (I think it means Deceleration Fuel Cut Off) which automatically cuts off fuel in certain cases but I'm not sure if mine has it. My vehicle is a 1.0L Toyota Vitz 1999.
But regardless of DFCO, the question is do vehicles still consume fuel when engine is revving hard down a slope without the gasoline pedal being pressed?
I've always been confused about this and would appreciate some information on cost(s) vs. benefit(s) of the said approach.
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