Sorry, I'm talking MPG not MPL, Here in the UK we still use MPG rather than the rest of europe using L/100km
On a 90L propane (LPG) tank with 85-90% fill, I get around 180 miles. On the highway i've had 250 miles out of it.

Ben

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Ben

'85 500 SEL
'85 928S2
'88 560 SEC
'90 750i