So I owned an FJ Cruiser for a while and decided to downsize in an attempt to save on gas. The FJ was great and served it’s purpose, but I bought a 2010 Mazda 3 Sport 5-Door last year for various reasons.
From the day I started driving the car the average MPG on the dashboard meter seemed low. I thought to myself, “Give it time…maybe it needs a solid 1k miles or so before it’s accurate”. Then I started checking the mileage at fill-ups manually. I found I was only getting 19-21 MPG on the HIGHWAY!!! Only 18-19 MPG IN THE CITY!!! Horrible. The sticker claims something like 28-29 on the highway and 22-24 or so in the city.
So I took it in to the Mazda dealership for an oil change and told them to check the “codes” to see if they could find anything related to the poor gas mileage. They called me the next day and said, “No error codes are present, therefore we can not do anything about it.” The only other option was to have one of their techs borrow the car for a few days to see what kind of gas mileage they get in it…somewhat assuming I had a lead foot. They also blamed the bike roof rack I had installed on the vehicle which is a Mazda OEM part.
So needless to say I gave up on the service dept at the dealership I purchased it from and found that many other Mazda owners are reporting the same problem on various Mazda forums; while others are reporting the actual mileage that is claimed on the sticker or better.
I won’t lie to you and say I’m easy on the pedal, but I don’t drive like a bat out of hell either. I go 5-10 MPH over the posted speed limit anywhere I’m at. In my opinion, the roof rack is in no way hurting my gas mileage enough to be of concern…maybe 1 MPG or something (in fact I noticed no difference in the first few months I drove it sans rack). I’ve checked the mileage manually and with the Avg. MPG meter installed on the dash and both are accurate. All service has been performed by the Mazda techs at the dealership and no codes are apparent so Mazda refuses to do anything about it.
Does anyone have any clue as to why I’m seeing such a huge difference in mileage? Any diagnostics I can run on it myself or things I might check?
FYI, it’s the 2.5 Sport model, 5 Door and it’s an automatic.
Thanks so much!!!