My BIL is using nitrogen and he gets it for free and never has to mess with tire pressure. But I can't seem to find it for free where I live. Until then, I check PSI frequently and make sure my truck does not fly. I also don't live in very cold climate and don't have to worry about frozen tires from the naturally occurring condensation with air.
No doubt there's benefits to nitrogen but until it's plentiful and cheap I'll be doing things the old fashioned way.
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