I'll play devil's advocate to: "If it ain't broke, don't fix it"--it might not be broken, but could it be better? Sure, your tried-and-true truck spec has worked for you for years, but the latest trucks have model year generations of refinements built into them. Whenever an OEM unveils a new truck with improved fuel efficiency percentages, the rub is that they're comparing the brand-new spec to their previous "best spec". Chances are, as a fleet manager, you're not replacing the truck you bought last year. You're replacing a truck that's five or six years old (if your lifecycles have returned to pre-pandemic normal).