Filling up ... full tank vs half tank

Strider590

bigjl. wrote: »

That'll be Mrs Strider then?

I think it's the neighbour... She works on the Morrison's fish counter

madaminx

I received this email today - is it genuine?

TIPS ON FILLING YOUR CAR(S)

• Only buy or fill up your car or bakkie in the early morning when the ground temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the fuel, when it gets warmer petrol expands, so buying in the afternoon or in the evening....your litre is not exactly a litre.
  
  In the petroleum business, the specific gravity and the temperature of the petrol, diesel and jet fuel, ethanol and other petroleum products plays an important role. A 1-degree rise in temperature is a big deal for this business. But the service stations do not have temperature compensation at the pumps.

• One of the most important tips is to fill up when your tank is HALF FULL.. The reason for this is, the more fuel you have in your tank the less air occupying its empty space. petrol evaporates faster than you can imagine. Petroleum storage tanks have an internal floating roof. This roof serves as zero clearance between the petrol and the atmosphere,
  so it minimizes the evaporation. Unlike service stations, at fuel pipelines, every truck that is loaded is temperature compensated so that every litre is actually the exact amount.

• If there is a fuel truck pumping into the storage tanks when you stop to buy, DO NOT fill up--most likely the petrol/diesel is being stirred up as the fuel is being delivered, and you might pick up some of the dirt that normally settles at the bottom.

• When you're filling up do not squeeze the trigger of the nozzle to a fast mode. If you look you will see that the trigger has three (3) stages: low, middle, and high. In slow mode you should be pumping on low speed, thereby minimizing the vapours that are created while you are pumping. All hoses at the pump have a vapour return. If you are pumping on the fast rate, some of the liquid that goes to your tank becomes vapour. Those vapours are being sucked up and back into the underground storage tank so you're getting less worth for your money.

DO SHARE THESE TIPS WITH OTHERS!

RichGold

I tank my van everytime I go to a filling station.



But then I do use over £400 worth of fuel a week. So putting half a tank in doesn't cut it.

forgotmyname

madaminx wrote: »

I received this email today - is it genuine?

TIPS ON FILLING YOUR CAR(S)


UTTER DRIVEL DELETED....

Underground tanks do not vary that greatly in temperature throughout the day, Thats partly why they are underground.

Fill the tank when half full, So you make twice as many trips to the fuel station? The garage forecourts dont have a floating roof.

Pumping the fuel fast creates vapour?

Fuel systems these days are enclosed. Why did my restoration project go into the garage with 1/4 of a tank and come out with 1/4 of a tank 5 years later if fuel evaporates that badly? Shouldnt it have boiled dry in that time?



Even if it did work and you drove past the fuel station every day the extra 20feet on and off the forecourt would use more fuel than you could ever hope to save.

Want more MPG, But the most fuel efficient car you can and strip the interior and the aircon and the spare wheel and anything else thats not essntial to keep it running. You only need one wiper for the MOT save a couple of grams.

Hadrian

reeac wrote: »

You're only talking about an extra 25 Kg. max. I challenge anyone to detect any effect on mpg. caused by that weight increase. Better to refuse to carry fat passengers.

Can I quote you when the Mother-in Law wants a lift?

red_eye

FATBALLZ wrote: »

A full tank (55 litres) weighs about 38kg I believe, so you're saving a weight of less than 20kg when you have a half tank. That's about one quarter of a person. I always fill up to the top (not least because I go through a full tank in less than 2 weeks) and never notice any difference between MPG after just filling up and MPG when the tank is nearing the empty gauge.

Of course it will make some difference, but it is so minute that it's a waste of time bothering with unless you have a petrol station in your garage.

you save more then just fuel, brakes, suspension clutch it all adds up to quite a bit over the ownership, also some one did calculations above but didt factor in acceleration. getting a mass moving takes more energy then to keep the mass moving