Im getting about 15.2 l/100k.this seems very thirsty.
Anyone got similar figures.

My EL futura never goes over 11 l/100k

take it to a mechanic and get them to put it on diagnostics. can be a range of things, such as oxygen sensor, map sensor, or even vacume leaks on the manifold.

yeah that does seem pretty thirsty, mine uses
highway - 8.5L
suburban - 11.5L-14.0 (depending if you drive nice or stomp it)
this is an obvious one, but i recently changed the leads and spark plugs, Bosch and NGK and that droped my fuel down about .5L...

your eather flouring it or it need a major service...