 Gas Mileage Question
So....
I was getting between 18-21mpg pretty consistently city / hwy driving for the past 6 months. I was @ 49K miles and decided to have a tune before a big trip so I had my 50K service done + a few other items serviced. They changed oil, plugs, filters, etc....
Noticed that for the couple weeks after my service I was only getting max 18 and my average was like 16.4mpg.
I bought wheels and 33" tires and now I am around 14-14.5 hwy!! I know tires can affect it a little but why the big drop after my service? I was getting close to 400 a tank and my last trip was 290 close to fumes!
Does it sound like I have an engine issue or a bad sensor? Dealer said when they did service that a thread broke in engine taking one of the plugs out and they had to re-thread it. Could that plug / cylinder not be firing right and I'm running a 5 cyl without knowing it? Plug leaking possibly and I'm losing compression? Thanks for your help.
Thanks.
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