For example, if you need to make a 10 km journey every week, if you use a bicycle for that journey instead of a car, you’ll burn as many as 300 calories one way and you’ll reduce your gas emissions by approximately 300kg per year. When you drive slower at about 90 km/hr, your vehicle would use about 25% less gas as oppose to when you’re driving at 110 km.hr. If you’re driving at slower speeds such as less than 70 km/hr, then you should avoid using AC since this will increase how much fuel your vehicle uses by about 10%.