haha, i hear it makes you hungry driving behind me!
Yeah, just like normal diesel biodiesel will wax at lower temperatures. the problem is with bio is that temperature is much higher. with bio made from rapeseed i think you're good down to somewhere between -6 to -10 where waxing is concerned but anything below 5 degrees and the fuel will be slightly thicker, hence the couple of cranks required to start. there are winterisers on the market which apparently work really well. other options are to add a %age of petrol of diesel, i;ve done both of these and never had a problem in winter, petrol is better as you need less for the same effect! usually 5% does the trick.
2-ehn is a cetane improve, basically the difference between regular diesel and premium diesel. this helps with cold starts, performance and fuel consumption. per litre it works out to pennies