I like to think that my driving style is quite consistant. I keep my car in shape and improve my eco-driving knowledge all the time.
Yet somehow my MPGs are steadily declining over the last 4 years:
I used to get as high as 26-27 MPG and now I can hardly get over 25.
Most of the time it's around 22 or less.
That made me think. What's wrong? Is it me or is it my car?
My 3 prime suspects are:
1. Catalytic converter - it may be getting clogged up after 20 years.
2. O2 sensor - AFAIK it has never been replaced - might be getting some off readings which get worse over time.
3. MAF sensor - same as with the O2.
What do you guys think? Am I on to something? Is it a thing that the fuel economy gets worse as some parts get older?
Or is it just me?