Taxi Driver Online

I know that the TX4’s are not known to be fuel efficient but mines a thirsty beast, only had it a few months or so, usually put £20 a shift and on previous cabs used to get 70 miles ish, this one a 2010 TX4 I’m putting in around £35 a shift and not evening getting 60 miles, I’m pretty sure something isn’t right, I know diesels gone up but shouldn’t be that massive of an impact, does smoke a bit grey/black smoke comes out through exhaust don’t know if that’s got anything to do with it, changed air filter and fuel filter, trued the additives fuel/injector cleaner still no different.

Anything else that could be causing it to drink so much.

Thanks