As a former chemist, I'd say that long(ish) chain alkanes are extremely stable at normal temperatures. After all it took millions of years to get to their current state in the ground. However, there may be some additives which could chemically break down - your diesel engine probably wouldn't notice the difference just from one tankful. A lot of engines don't take kindly to bio-diesel (usually in the fuel injection system) but the odd tankful wouldn't be fatal.
Really - I last filled mine up on 20 March and its still well over 3/4 of a tank in it - I have done a total of 70 miles since then and the car still says it has a range of 450 miles- I should still be on this tank at Christmas at this rate. I am using more petrol in my lawnmower and strimmer than I am diesel in the car at the moment
same here I filled mine up a week or so ago, done just over 100 miles and it says I still have a range of 575. 1.6 Tdi
Ah my days of getting between 600 and 700 miles on a tank went when I got rid of my 520d - I did get over 700 miles out of a tank on a few occasions My XF is less economical (more powerful and awd) and has a smaller tank - range is about 100 miles less now
I've made 3 abortive trips to B and Q at Cortonwood though, had to turn round and come back each time because it was packed. That's about 15 miles round trip each time
Put some diesel in this morning - kept an eye on price dial and it shot to £2.20 as soon as I pressed lever on the thingy that goes into the tank. How accurate are these machines that record fuel input and cost?
I had a 525i M-Tech Sport 6 cylinder petrol. I was never sure which was faster....the car or the downward movement of the needle on the fuel gauge dial. Nursing it (what is the point if you do?) I could just about manage 14mpg on local runs and a heady 28 mpg on longer runs. Driving normally without being daft meant around 17 mpg!!! Once thrashed it round a private track and got 8mpg!!! utterly bonkers given it was quite a big motor to be throwing around (probably shortened the tyre life by about a year in 30 minutes). albeit great fun. My 4x4 Yeti 2.0TDi (4x4s are advisable where we live now) returns around 18km/l on short hops and 28+km/l and the torque you get off a diesel (which is far cheaper here than petrol) is special meaning far less gear changing on twisty hairpins on mountainous roads. I am sure BMW diesels (and most modern ones) are far more environmentally friendly than most hybrids in spite of all the adverse press.
On their Facebook page they say they are reorganising the internal layout to make it safer, but they won't open yet as they consider it too soon. It will be June at the absolute earliest, but that will be decided upon nearer the time.
