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On a somewhat side note, this topic is also kicked around quite a bit on the Diesel truck forums. Mainly due to the quest for more engine braking power when towing. Side by side, with identical transmissions, the gasser will provide more braking power because of the vacuum pulled against the throttle plate that is absent in the Diesel.
Various people have suggested things like putting plates in the intakes for more vacuum but most Diesels aren't designed to pull vacuum in the intake and you end up pulling oil out of the valve seals and from the turbo compressor labarinth seal. This is why the aftermarket simply puts a valve on the exhaust to gain the additional braking power.
On my truck and I think on my '98 as well, the injection is completely shut down by the PCM in a coast situation to further aid the braking action.
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-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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