I tried some crappy cologne my wife bought for me and didn't like it. I put a dozen squirts into my RC car fuel jug. Every now and then you could get a whiff of Polo Sport. It still smelled like glow engine exhaust for the most part, I suppose adding more scent would work better. Curious how well this would work for a gas engine. They run so hot I wonder if you'd be able to smell the scent over the exhaust?