With $5.00 plus per gallon for #2, propane injection commonly called a Torque Topper may be tempting to some.
Or having propane for your camper to cook with is a more common use.
Either way, watch out for any green brass valves on propane tanks: http://www.npga.org/i4a/pages/index.cfm?pageid=529

I guess this is how the Meth Heads are Going Green.

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2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

The ones on my boat were a bit green green and here all this time I though it was the salt air.

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2006 Libery Sport CRD, Lt Kakhi, nicely equipped
*****GDE Hot Tune at 38,879 miles
*****Stock TC.....for the time being!!

Reasons why I OWN my own propane cylinders, rather than exchange them.

Or, it could be that the exchange places are charging about $4.50 per gallon for the gas (since you only get ~4 gallons per 5 gal bottle) while the BYOB LP vendors were selling for $3 in my area.

Does anybody have experience with propane injection in a CRD?

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2005 CRD Limited, ARB bumper, Frankenlift II, ORM, Aero Turbine 2525, Suncoast+TransGo, InMotion ECU reflash, RockLizard, Cragar Soft 8's, Green Diamond Icelander A/T 265/70/17's, Gibson snorkel, fording extensions on diffs n transmission.