Car fuel consumption figures depend on: The energy required to increase kinetic energy –Avoid harsh acceleration and heavy braking. Pulling away too fast uses up to 60% more fuel. The energy required to do work against friction: –Remove roof/bike racks if not in use. They create drag and increase fuel consumption. For the same reason don't have windows open over 40mph. –Under-inflated tyres have increased rolling resistance and increase fuel consumption - Also, increased wear of tyres different driving styles and speeds: –Driving at 70mph uses 30% more fuel than at 50mph. –Lots of acceleration and braking increases fuel consumption different road conditions: Driving in town uses more fuel Fuel consumption can be measured in Miles per gallon Miles per litre Litres per 100 km

Electric cars Electrically powered cars do not pollute at the point of use whereas fossil fuel cars do. Battery driven cars need to have the battery recharged: this uses electricity produced from a power station; power stations cause pollution.

Electric cars of the future The Tesla Roadster: 100% electric 0-60 in 4 seconds Top Speed 130 mph 135 mpg equivalent 250 miles per charge 6,831 lithium ion cells per car — arranged in a half-ton block G-Wiz i CO 2 emissions: Zero MPG: 600mpg equivalent Kerb Weight: 665 kg Top Speed: 50 mph Range: miles Charge time: 2.5 to 8hrs 8 lead acid batteries