Filling Up
Petrol lightens the wallet but weighs down a car.
Each litre of petrol weighs .65kg so a full tank of 70 litres can weigh as much as 45kg. That is a lot of weight to carry around. Conservely you do not want to be putting £5 worth at a time in as you will spend a fortune looking for petrol stations.
The happy meduim is probably about half a tank.
It’s also worth mentioning that petrol does evapourate and also goes off – old petrol is not as efficient as nice fresh petrol. This effect is less pronounced with diesel. If you drive your car very little, don’t let it stand around (especially in summer) with a tank full of fuel.
There is some talk of the ambient air temperature effecting how much fuel you get at a pump. As it gets colder fuel becomes a little denser – basically a litre of ice cold fuel contains more bangs than a litre of warm fuel. This is not really an issue – yes cold fuel is denser but fuel is stored underground and outside temperatures are unlikely to effect the temperature of the fuel in any significant way. Check out this government report on the issue if you are at all concerned – http://www.nwml.gov.uk/Docs/FAQs/MID/NEL%20REPORT%20Temp%20Comp%20on%20LF.pdf
Hypermilling.co.uk is simply a small website about hypermilling – hypermilling techniques wll be listed and explained, news about hypermilling listed and links off to useful hypermilling resources.
Remember – being safe is more important than miles per gallon and even a small bump will totally negate any savings made by hypermilling.
You should always make sure your car is totally road legal and your car insurance is up to date, if you have any doubt contact your car insurance company.