Second rapeseed drive

Today I bought in one of near malls five 3-litre tanks of rapeseed oil for only 9 PLN each (0,8 gallons for $3,15). I can't say it was cheap, but it was the cheapest vegetable oil I could find. I started the engine on 1:1 mixture and added the rest. When I turned the key to "on" position I heard some weird noise from under the cooler. I think those were made by electric fuel pump...



So I poured the 15 litres (4 gallons) of vegetable oil to my fuel tank and went to a normal filling station. A Neste gas station it's a brand of self-service gas stations, you pay at the pump before you pump ;) . I wanted to fuel my tank full with standard diesel fuel. I calculated that finally I had 2:1 mixture (diesel:vegetable).

I calculated also the mileage for that period, 7,7 l/100 km (30,5 miles per gallon). 1 l less than previously. I recorded distance of 793 km (493 miles), half driven in city traffic, rest driven outside towns. I assume that driving slowly (70-80 km/h (43-49 mph)) will give me even better mileage.

I can't say what was the mileage on rapeseed/diesel mixture, because I used only 5 litres of that mixture on that distance.