My 2007 Mazda CX-7 consumes a lot a fuel. A full tank is empty in 5 or 6 days and that's without using my ac! I bought fuel on Monday night and today, Thursday, it's already at half tank! It has a turbo engine but I never go beyond 60miles/hour (and that's for short distances on the expressway). The consumption is crazy! I've checked the exhaust pipe and cleared P2006 and P0403 codes. Still no change. The catalysts are not the original ones but there are no issues raised on the check engine reader. Nothing on 02 sensors and catalysts. No other codes. Mechanics have been perplexed over this. I would appreciate any help or advice as filling my tank twice a week is crazy! And I dare not use the a/c while driving. I basically use my car to drive to work and back on weekdays i.e. a total distance of about 60km (37 miles) and a total of about 3 hours a day. But consuming about 60 litres every 5 days is unusual. Please help!