ive heard aobout filling up tyres with nitrogen, but say for example you are going for a long journey and find your tyres are maybe 2-3psi lower tha you want, ao you want to pump them up. where do you go then. Cant say ive seen a nitrogen pump in a garage or service station. can you just mix air with it,
if so doesnt that just negate the whole point of nitrogen in the first place