Veg Oil Update

Well, we’ve now used up a whole tank, with good results:

40 litres of diesel @ £1.43.9
+ 20 litres of new and unused cooking oil @ £20.00

gives the cost of a tank @ £77.56 (this is equivalent to £1.29.3/litre)

Mileage has gone up too 😀 so we now get 690 miles out of a tank before the warning light comes on. This equates to almost 55 mpg, a 10% increase on the best we’ve seen previously, which was already a pretty good figure. Renault quote 48 mpg for the combined cycle, which is usually a pretty accurate figure for the most you can eke out of a tank, despite what Which? magazine has to say on the subject…

So, all in all, my wife and I usually do about 1500 miles or more each month, (we live in the country, so everything’s flippin’ miles away).

1500 miles at 50 mpg and £1.43.9/litre costs £ 196.16 – (13.1 pence per mile)

1500 miles at 55 mpg and £1.29.3/litre costs £ 160.24 – (10.7 pence per mile)

A grand saving of £35.92 a month or 2.4 pence every mile or £431.04 annually. Not bad, considering the car cost less than £600 in the first place.

Perhaps I should put that amount aside every month. So long as the car lasts 18 months with no veg oil related problems, then I think we’re on to a winner…


This post is an update from a previous post which you can read here – Running a Car on Cooking Oil

6 thoughts on “Veg Oil Update”

  1. Have you not considered hitting your local chippy for their left over oil, a lot of people get their oil from local takeaways the downside (or upside) is that your exhaust will have a slightly different aroma.

    1. Yes I have, but used oil does need some processing as it contains water and BCB’s (burnt crispy bits).
      The BCB’s are straight forward enough to remove by basically putting it through a filter with at least the same or better rating than the one in the car. Most cars remove particles down to 5-10 micron size, so it can take quite a while for the oil to go through (remember, in the car it’s forced through under pressure by the fuel pump).
      The water on the other hand, does require some nasty chemicals to be added to process and remove it, so although the oil can often be had for free, there are consequences to processing it. One of these is your home insurance will almost certainly be void if you do this at home, and another is the local council may want to licence you for safety reasons, as I believe the chemicals involved are highly flammable, and should the worst happen your neighbours’ insurers will probably sue the arse off you, so it’s probably less hassle to use new oil.

  2. I’d love to hear any further updates on how the car has been running on this veg oil & diesel mix – considering following your example & running my car (Renault Megane 1.5 dCi) on the same mix.

    1. It’s been OK. It’s the second Renault I’ve done this with, although with the cold setting in, I’ve been using less or no veg oil, as starting seems to be a bit harder in the cold weather. I found this with my old clio too, but come the warmer weather it was fine when I switched back again

      1. That’s great news! I’ll certainly give it a go then when the weather warms up a bit. Many thanks for the update & happy motoring 🙂

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