Michael Petruccelli asks; As a vehicle ages,does its fuel economy decrease significantly?

Michael Petruccelli says; A vehicle that is properly maintained will retain its efficiency for many years.

Michael Petruccelli asks; Does replacing your air filter will help your car run more efficiently?

Michael Petruccelli says; Modern fuel-injected engines automatically adjust their fuel-to-air ratio. Changing a filter won't increase fuel economy, but might improve performance.

Michael Petruccelli asks; Does using premium fuel improve fuel economy?

Michael Petruccelli says; Unless your vehicle was specifically designed for premium fuel or knocks severely with regular fuel, you will likely experience no benefit from using premium over regular.

Michael Petruccelli asks ;Do Vehicles need to warm up before they can be driven.?

Michael Petruccelli says; Modern vehicles can be driven within seconds of being started, though the engine should not be subjected to extreme conditions until it has fully warmed up.

Michael Petruccelli asks; Does It takes more fuel to start a vehicle than it does to let it idle?

Michael Petruccelli says; Idling can use a quarter to a half gallon of fuel per hour. Turn off your engine when your vehicle is sitting still for any time longer than a traffic light.