BMW actually had a small fleet of either propane, hydrogen or natural gas burning E38 7 series years back. (don't remember which it was) Maybe search that up to see if there is any info/specs on how BMWs ran with it when it was set up properly by BMW themselves. The E38 740 had the same basic engine as the 4.4i so all the same should apply. Come to think of it they even had a hydrogen 7 with the E65/E66 7 series.

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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

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X5 pics

RIP 4.6is.....

2003 4.6is