2.4 Nissan improve gas mileage Source Source Source Source Source Source Source Source Source Source Read Also: How to improve a 2000 nissan frontiers fuel mileage Improve gas mileage 2002 nissan pathfinder 1991 Nissan truck improve gas mileage Improve gas mileage 2000 nissan xterra Improve gas mileage 2005 nissan xterra Improve nissan titan gas mileage