Should I convert my 4-stroke engines from regular gas to propane
As you already know, there are pros &amp; cons - it isn't a simple decision. So take each device separately as they are actually quite different:

Portable Generator

How often do you use it? Job site or fixed location? Power outage or "some tasks always need a generator"?

The more you use it, the more replacement with propane may make sense. But if it is only occasional usage then the environmentally &amp; financially speaking the fixed costs (i.e., energy used in manufacturing and cost to buy it) will have a very long payback time.

Lawn Mower

Depending on:


Size of your property
Usage elsewhere (e.g., if you use the mower to mow other people's lawns)


you may be far better off with a battery electric mower. There will still be emissions, but at the utility plant which are (a) typically (unless coal) cleaner and (b) don't have the same direct impact on your (and your neighbors') air quality.

Snow Blower

Battery electric may make sense here too, but depending on how frequently you get snow-blower-level snow (the more frequent, the faster the environmental and financial payback of switching) and how much power you need, sticking with gas may make a lot of sense.