Is there any advise to improve gas efficient, what about replace air filter hose system

NO NO NO, to replacing the air filter system. There is a lot miss leading information as to the "Cold air intake systems" We have tested and shown our clients that not very many work, and most are all "HYPE"! We have used temp reading equipment and monitored the temp from the air cleaner to the intake manifold. We found the stock equip was far cooler (60 DEGREES) than the "cold air systems" THEY WERE USING OR WANTING TO USE. The main reason for this, they where not properly insulating the tube. The cold air tube was absorbing the HOT air from under the hood, and the outside temp flowing through it was not cooling it off, like the factory one does. If done properly, the temp would be much cooler, but there is no aftermarket companys that send the insulation package with the cold air system. We have used insulation from a local heating/air condition company that they use on duct work. This made a significant difference in temp from the outside air to the throttle body, and made it a REAL COLD AIR SYSTEM. Keep the tires properly inflated, get a 4 wheel alignment to insure the tires are rolling straight and true, keep the filters clean, switch to a synthetic oil, wax the exterior of the vehicle for less wind resistance,( ever seen a high speed car dirty?) push on the gas pedal when taking off, and letting the vehicle coast down when coming to stop, using less brakes. Hope this help you