"IMM" wrote in message
...

"Marcus" wrote in message
...
Yep, an old lorry drivers trick for winter for sure, no problems at all
caused by the 10% petrol addition.

Keep the diesel tank topped up all the times. Every other day to keep the
diesel/petrol ratio in favour of diesel. Eventually the petrol will
disappear.


Hmm..gullible and unscientific, it seems :-)

As your 10% petrol in diesel is unlikely to cause you any problems, use at
least half the tank, preferably at least 2/3 before refilling.
This will ensure you remove most of the petrol quickly then go to almost
100% diesel.

i.e.
[Assume that the tank hold 100 'units' of fuel]
Full tank of 90 units diesel 10 units petrol
Use 90% of the tank
Tank has 9 units diesel and one unit petrol
Fill up with 90 units diesel
Full tank with 99 units diesel and one unit petrol (effetively pure diesel).

This after using 90 units of fuel and only one visit to the fuel station.

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Gridingly boring worked example:

Full tank of 90 units diesel 10 units petrol

Use 10% of the tank
Tank has 81 units of diesel and 9 units of petrol
Fill up with 10 units of diesel
Tank has 91 units of diesel and 9 units of petrol

Use 10% of the tank
Tank has 81.9 units of diesel 8.1 units of petrol.
Fill up with 10 units of diesel
Tank has 91.9 units of diesel and 8.1 units of petrol after using 20 units
of fuel.

Compared to

Full tank of 90 units diesel 10 units petrol

Use 20% of the tank
Tank has 72 units of diesel and 8 units of petrol.
Fill up with 20 units of diesel
Tank has 92 units of diesel and 8 units of petrol after using 20 units of
fuel.

So already a small difference is showing in favour of using bigger amounts
of fuel before filling up.

So long since I did any maths I can't face working out a formula but suffice
it to say that it is more effective to use as much of the 10% mix as
possible before refilling your tank.

Someone out there must know the formula!

Damn I must find some motivation to work!

Cheers
Dave R