Be careful. Some LPG injector systems have electronics that aren't quite as robust as OEM gasoline equipment, so if you let it get too hot, you might fry something (not literally...).
Why not a block heater? Just throwing it out there.
Also, even if the LPG installer has tuned the engine for best economy, it's not tuned for best power. If you can get to a shop with a dynamometer and bring the installer's laptop, they can tune to give you a bit of extra power. Power by itself doesn't make for better economy, but having a little more kick gets you up to cruising speed quicker, which does.
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