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Old February 7th, 2018, 10:31   #8
Phd of TDIClub Enthusiast
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Join Date: May 1999
Location: Canada

Propane stores as a liquid, so it has a much higher BTU per volume stored - a tank that fits in the spare tire hole holds more propane than a CNG tank that sits between the rear shock towers.

OTOH, CNG has a higher octane rating and autoignition temperature, making it more resistant to knocking and preignition when fumigating it into the intake of an engine and compressing it 19.5:1.

TDIMeister's German-imported 1998 Audi A4 Avant TDI quattro

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