"Increased my overall mileage per gallon."
Exactly as described. Just returned from a 6500 mile road trip. Increased my over mpg on my 2500 mega cab. These days every extra mile is worth it. Before I was getting 20.5 mpg on the truck, with this on it was 22.5 mpg. It gives a really secure seal, I love the magnetic ability, I never lose it, just stick it on truck side while fueling. I’d recommend this. I will say it takes a bit getting use to, as it seals so well it’s so snug when trying to remove, but you get use to it.