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excellent points. thanks.
i didnt know the injectors can overheat. i was aware of the fuel pump, but to be honest i've never experienced a failure, or known someone who has...yet.
on the cooler fuel in point 1, its really best to do it in the wee hours of the morning or on your way to work(day job). it takes several cold hours after sunset fore the tanks to cool. admittedly there isnt a huge variance, but anything is better than nothing.
i notice that my local servo(shell) is often filled late at night(10-11pm). so for me i get the double whammy of a settled tank and cooler fuel :)
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IHMO you dont want to be early in the morning (unless its a busy 24 hr servo) as thats the time that your most likely to pick up the water thats fallen out of suspension in the lines if your in the first dozen or so people to draw fuel. There comes a point where the % of extra fuel you gain from cool fuel is outweiged by the increase in the % of water by volume you might pick up.
water in suspension all diesels are capable of handling, water by volume not even a petrol can deal with.
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The only accurate way to measure your fuel consumption is to fill the tank to the brim. This is painful as the last 10 odd litres, from the time the pump triggers off to liquid just under the filler inlet, can take more than 5 minutes. This is due to the frothing of the diesel. Run the tank as low as you feel comfortable, then fill to the brim again. If you have larger than factory spec tyres, you need to also compensate the % difference in rolling diameter. I'm not an economical driver, however I average around 11.2 - 11.8 l/100km constantly. Compared to the V8, this is great!
