HI COULD ANY ONE TELL ME WHAT RANGE SHOULD I GET TO A FULL TANK ON A ASTRA H 1.7CDTI SXI. ON MY LAST ASTR 1.7 DTI I WAS GETTING 480 + MILES TO A TANK. i HAVE NOT LONG HAD THIS CAR AND NOT INPRESED SO FAR COMING UP TO 3/4 TANK USED AND DONE 280 MILES ISH. DRIVEING STLYE IS NOT HARSH IS THERE ANY KNOW FAULTS TO LOOK AT. TYERS GOOD AIR FILTER GOOD. ANY INFO WOULD BE GREATFULL WHAT DO OTHER OWNERS GET.

THANKS