Will going from 37 inch tires to 35 inch tires increase mileage?

Switching from 37-inch tires to 35-inch tires can potentially improve fuel mileage. Smaller tires generally weigh less and have a lower rolling resistance, which can lead to better fuel efficiency. However, the actual impact on mileage will depend on various factors, including driving conditions, vehicle type, and how the tires are used. It's also important to consider that changing tire size may affect your vehicle's performance and handling.