ABF in a mk2 will do over 40 mpg quite easy
a few years ago i filled my mk2 in filton bristol when heading out to the ring toped up in belgum and again near the ring ( only because the gadgue lied like a cheep rug ) the to topups were less than a tank
thats 420 miles ish on less than 55 ltrs
on the way back i left with a full tank stoped off to see a friend somewhere along the a12 somwhere after clemsford, wasent far off the m42 when fuel was required work that out but it over 400 miles and we were seriously stamping on for a large chunk of the journy as we thought we'd got the ferry times wrong and were going to be an hour late it, manage to make it then realised we had an hour wait oops