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Re biodiesel
I tried biodiesel shortly after I got my vitara.
Here are my observations.
I was paying 90p a UK gallon for it. It ran smoother than regular mineral diesel fuel. It returned less mpg than regular diesel to the point that there was no financial advantage in the price difference.
Especially as I had to go some 20 miles each way to fetch it.
Ive been experimenting with various fuels and find the following gives the best mpg.
10 parts of regular diesel
2 parts of bio diesel
1 part rapeseed oil
1 part kerosene.
theres no doubt that the common rail electronically pulsed fuel injection controls the burn rate to the ideal prerssure diagram of the power stroke. Resulting of course in much improved torque as well as fuel economy.
However all the indications ive had about common rail are that its prone to primary pump pressure failures Mazda in particular have had problems at 50,000 miles to the point a class action seems likely.
The peak of a diesel torque curve has to occour when the burn rate of the fuel matches the piston speed on the power stroke.
This gives te lowest peak combustion pressure with the longest burn rare to give the longest steady pressure on the piston.
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