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Originally Posted by Lil bastard
The accelerated wear to the clutch and synchros is gonna cost you 10 times the cost of replacing the brakes - use the brakes !
Neither method is gonna give any fuel saving !
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if done properly, a blip-throttle downshift doesn't really use the synchros or wear the clutch. the important thing is not to slow the car by slowly releasing the clutch (using clutch slip to slow down). this applys reverse torque to the clutch friction surface & will cause accelerated wear.
as for fuel consumption, you use no more fuel than you would at idle when under engine braking. this is because the throttle position sensor (TPS) senses zero percent throttle & acts accordingly.