Unimog Club UK

you can get 18mpg out of a 900, more if you drive carefully, regarding filling the tank for chipping, no idea, we never really bothered to check, i know we used to stick a 25 liter barrel of diesel in the back and sometime we used it, sometimes we didnt, i suppose it depends if youre using the chipper all day relentlessly or not.

I've never used more than quater of a tank, so about 20ltrs in a day. That's traveling and chipping. Chip box is about 6cube. 

i recon you just stand there and try to look good, cause ive no idea how you manage that! maybe its cause yours has never been fueled up? although we used to fill mass off tractor trailers with the chipper.