dschuffert
Silver Member
I have a 2011 F250 Powerstroke Diesel that is Tier 4 compliant. It has a diesel particulate filter, a complete separate cooling system for the EGR valve - it's own coolant tank and radiator along with it's own water pump, and uses DEF when needed. A lot of cost, hassle, and maintenance to prevent soot and clean the air. I lose at least 3 MPG when the system goes into regeneration to clean the DPF. This is the exact strategy the John Deere has posted on their Tier 4 compliance information page. I often wonder, but have no way to really measure it, whether the reduced MPG which causes me to burn more fuel to get somewhere but cleaner exhaust is better for the environment or to have a dirtier exhaust but burn less fuel.......