hi i bought this motor for my mrs, was in bits as mazda couldnt solve problem whatever it had before,they but new turbo on,and didnt cure it wotever it was so car got stored up. when i bought it, it didnt run,eventually we got it running and it filled garage with smoke etc. took injectors and they were all knackered badly. so put new ones in, starts okish, but sounds like low on compression,but when take for drive goes really well, but on info dash about economy when you thrash it, it goes up to 50ish to gallon, but when ya cruise it goes down to 3 if lucky, is it vacum controlled etc,and only pulls from 2000 rpm. any help be great. thanks