That's assuming I burn through 2.5 gal in 500 miles. In my case that's not so. Even towing I'd probably get about 750 miles. I haven't tracked mileage for being empty but 125K will be less than $1700. Many will spend way more than that on aftermarket wheels/tires plus loose money at the pump with the added unsprung weight and rolling resistance. As far as longevity, the real determining factor is how well you know your truck and how much attention you pay to it. I will keep my emissions for now and see how it goes. I have plans for possible manual cleaning myself unless a viable option comes up in the market. To each his own. I enjoy reading both perspectivesOver $1700 for the 125,000 miles. Still something to put into the equation.