Yup. Go one step colder, at least.
The rest will be up to your driving style.
If you want to look at improving performance, check how your vaporizer is connected... sometimes the car's standard thermostat blocks off the coolant bypass route that takes hot coolant to the vaporizer. You'll want to check that out. If you can keep vaporizer temperature as warm as possible, that will improve LPG stability.
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