My car is a 2011 CX7. I used to get decent gas mileage until I came back after a road trip last month. I did a proper car service before the trip. I got no issues relating to fuel efficiency or anything else during the trip as well. A couple of weeks after the trip I noticed that fuel efficiency has come down significantly. I though it was some leak or something, but couldn't find any evidence of leak in the garage. I am someone who tries to get maximum fuel efficiency and follows advises for the same from experts. This sudden dip in the fuel efficiency bugs me and want to correct it asap. I would like some help or advice here. Thanks!
I didn't notice any noticeable issues with power or noise from engine. May be I should look for something. Also, I have checked tire pressure recently and refilled it. But I think 2 rear tires are close to the end of their lives. Do you think it can be the reason? I believe there was no big change in temperature or climate to cause such a change.
Worn tyres wont give worse economy necessarily. If its just had a service, check the HT leads on the spark plugs are all on properly, and check the airbox and all related pipes are connected properly too.
Just a thought, could you have had the pump cut off very early on the previous full tank?
I'm pretty sure i've had some false high then false low mpg figures with a dodgy pump cutting out a few litres too soon.