Renault Laguna

Veg Oil Update

Renault LagunaWell, 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

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This entry was published on May 9, 2012 at 2:20 pm. It’s filed under Fuel Efficiency and tagged , , , . Bookmark the permalink. Follow any comments here with the RSS feed for this post.

6 thoughts on “Veg Oil Update

  1. Pingback: Running a Car on Cooking Oil « In The Metal

  2. 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.

    • 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.

  3. Pingback: InTheMetal – Running a Car on Cooking Oil

  4. crinklecut on said:

    looks like we have ust murdered a peugeot 306 1.9 hdi engine with veg oil, used but filtered very finely. Really I would be wary of using it in anything other than a standard old skool diesel engine! I’m interested to know how you are getting on if your engine is a common rail.

    As for getting oil from your chippy be careful, a friend of mine suffered a hefty fine, as did their kebab shop as apparantly only a licensed waste carrier ought to “dispose” of oil. The police round here can be prety tight 😦

    best of luck

    • For the reasons above, I don’t get oil from the local chippy and only buy oil new. AS for the car, no, it’s not a common rail, the diesel pump has 4 separate lines, one to each cylinder, so yes, it is certainly “old skool”. I’m not using oil currently, because of the colder weather. The car is hard enough to start already in these temperatures. Generally, I only use oil over the warmer months because it is so much thicker than diesel fuel and you’ve got to give the fuel heater a bit of a chance, so as soon as the temperature starts to drop, and the car takes a bit longer to start, I switch back to just diesel for the winter. Come April, I’ll be using it again though.

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