the trip on my old citroen was terrible, it said i did 65mpg over a week once, but i did the sums 690-miles from 57l of derv, but thats only 54 mpg.
my 2.0d gets about 42mpg. most ive got is 44mpg. sums are easy the tanks is almost exactly 10 gallons lol, take my week trip miles divide by 10. I dont have a trip computer on my car the guy who ordered it new wouldnt stump the £200 for it as an option but paid £650 for a tow bar, wtf? the problem is my fuel guage, well more the tank the clio and citroen the guage went down in a uniform, the c4 got 150 miles per quarter rougly, this i get 150 from the 1st 1/4, then no more than 115 from the next then 85 from the next then the fuel lights on then its only about 60 miles left lol, right till the needles clean off the guage. who'd idea was it to only put in a 50l tank, the petrols get 60+litre ones.
i miss my old 1.6 mk1 laguna, it dropped really quite quick to the 1/4 full mark then it stopped and started to go back up slightly every time i started it, by the end of the day i has another 1/8 of a tank than i started with lol. i'm sure that thing did about 300 miles to £20.