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You can window your block with any power adder, even more fuel, just to make that clear. I've never read anywhere that said propane will window your block a thousand times faster than anything else.
You're not going to put a hole in it running propane as a mpg booster, either. Used in moderation it will be fine. But, as I said I wouldn't pick it for big power gains at the track or hooked to the sled, or on a dyno.
ProPAIN... in any moderation equals high Cylinder pressures... Just a fact.
Dont do it.