I am lucky enough [?] to drive a diesel-powered car in the UK. It is not powerful, nor is it a recent model, but it gets me from where I am to where I want to be and back again in comfort.
But it drinks diesel like a fish drinks water, mainly because it is fitted with much smaller tyres than it was originally designed for.
So, last Spring, I decided to supplement pump diesel with the contents of my deep-fat fryer. This gives me about 3 litres of clean fuel every two to three weeks. After I have processed it, I mix it with diesel, depending on the ambient air temperature. In the height of the UK Summer, I got away with a 50/50 mix, but in Spring and Autumn, I drop ot back to 25% bio to 75% pump diesel, and in Winter, I use 100% pump diesel.
This is because bio emulsifies at a relatively high temperature and will clog up the works in a typical UK Winter.
However, this would not be a problem in warmer climes, such as Kenya. So when KCIS eventually gets itself organised enough to actually own a vehicle, we will be getting a diesel, and we will run it on a bio-diesel mix.
If we can find a major source of used cooking oil (just how many fast food outlets are there in Nairobi?), we may be able to produce enough to pass on our excess to the likes of KWS, Rhino Ark, the UN (but not for their petrol-guzzling Hummers) and any other organisations running fuel-hungry diesel 4x4s.
It will be a lot cheaper than pump diesel and performance is not compromised.