Hubb Filters introduces its Fleet Savings Calculator, designed to help fleet managers compare their oil change costs and the potential savings they can achieve by switching to the Hubb filter program, according to the company. To use the calculator, fleet managers plug in how many Class 1-4 or 5-6 vehicles they have in their fleet, along with the number of preventive maintenance (PM) scheduled per year, per vehicle. An instant cost savings analysis of what Hubb could save a fleet, according to the company, over a four-year period is presented.