Sue Have look at this, tips for saving Fuel
Avoid High Speeds - When driving on the motorway try and stick to 70mph. Avoiding high speeds on motorways and A-roads can save a lot of petrol. Around 50% of the power produced by the engine is used to overcome aerodynamic drag. Drag increases rapidly above 70mph so you fuel consumption will suffer.
Smooth Driving - Acceleration and deceleration is what uses most fuel. For this reason you will improve your fuel consumption with smooth driving, heavy braking can be reduced by not tailgaiting and slowing down gradually when coming up to a red light. Also avoid heavy acceleration from the lights and try not to rev too much.
Use The Right Gear - To maintain low revs whilst driving you should change gear as soon as is practical. Engines run most economically at revs between 1500 and 2500 so aim to always be between this unless more power is required.
Don't Coast In Neutral - Modern cars automatically shut off fuel to the engine if you're not accelerating, but in neutral the engine will still use a tiny amount of petrol, so when cruising up to the lights keep the car in gear.
Close Your Window - If you are driving fast then don't have your windows open unless necessary. Having the windows open causes significant drag which increases fuel consumption
Pump Up Your Tyres - Under inflated tyres increase resistance which harms your fuel consumption. It is estimated 50% of tyres on the road are under inflated. Check your car manual for the recommended pressure then go to your local petrol station and use their pump, this is normally free! This is one of the easiest and quickest ways to instantly improve your fuel consumption.
Check For Wear - If your tyres are bald this is not only illegal but dangerous and harming your fuel economy. Call up your local garage to get the required amount of new tyres fitted.
Fit Thinner Tyres - Thicker tyres have more rolling resistance which means higher fuel consumption. Fitting thinner tyres will improve your fuel consumption, however your car will not handle as well with thinner tyres. Always seek advice of a garage before buying thinner tyres
Get your car Serviced on a regular basis
Cheers Dutch RR