I think the Bosch P38's must be better on the juice! Mine (4.6 litre with taller tyres) returns near 11's to the 100 on highway runs, that goes up to 13 fully loaded on a trip with my foxwing and oztent on the roof.
Around town is a tad higher (14.5 outta the last tank with lots of small trips).
My apologies for going off-topic.

