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Old 02-04-2008, 01:57 PM   #8 (permalink)
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Join Date: Jan 2008
Location: SF Bay Area
Posts: 150

Silver Bullet - '02 VW Golf TDi
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Originally Posted by tasdrouille View Post
I don't know about an average gasser, but my TDI uses 0.6 L per hour when idling. I don't consider off coasting is really worth it. I coast when possible, but in neutral.
I've measured (with a VAG Com) my TDi's pulse bandwidth at zero while coasting in gear above 26 mph in 5th gear. Fuel cut-off while coasting is a well-documented feature of VW's TDi design.

The only "problem" with this feature is that the car will coast nearly twice as far in neutral (consuming 0.5 l/h on my VAG Com) as it will with the car's inertia turning the engine while coasting in gear, so the question is...which is more efficient? I strongly suspect that it's 6 of one and half a dozen of the other, so like tasdrouille, I simply coast in neutral with the engine running using the pulse-n-glide technique pretty much all the time.
Best tank ever: 72.1 mpg in February 2005, Seattle to S.F.
New personnal best 'all-city' tank June '08 ... 61.9 mpg!
Thanks to 'pulse-n-glide' technique.
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