Tuning for fuel efficiency

[Toms306]

25ppl is a good "normal" price to pay for collected oil from restaurants. If it's crap you don't pay anything. It's decent quality and I filter it plenty (more than I used to) it's all nice clear liquid.

Looked at lpg in past but I don't like the idea of an lpg tank in the boot I'd hate to be rear ended in a crash pop the tank and a spark, I'd hate to think of the explosion.

Ah ok, I didn't realise you filtered it yourself.  That's not so bad then....but I'd still be interested to know if theres an MPG difference between the filtered used oil and the fresh stuff. 

Piggy seems to have covered LPG lol.  My mate had an LPG Fiesta about 4 years ago, LPG was only 40p ish at the time so was properly cheap to run for him! 

[nominous]

Certainly finding that fresh oil is runnier at lower temps. Thus less fats or perhaps palm.
Also the stuff I was getting I now understand had oxidised.

LPG:

www.youtube.com/watch?v=5-nOPvXiIWQ
www.youtube.com/watch?v=H4ZKKyclrjA
www.youtube.com/watch?v=jSeifottg_Y

stir stir

[Piggy]

Note none of them in the UK where proper regulated tanks are used.

[nominous]

Why let details get in the way of good explosions?

[Dum-Dum]

Also none of them are crash damaged cars and petrol tanks can still explode.