My Toyota Matrix has been getting 26MPG in the winter time and up to 38MPG in the summer. But after 8 years of driving I found out that I needed to change the spark plugs. Mostly because the winter MPG has gone down to 20 and thats bad. I am just hoping that this is because of the winter blend of gas but we shall see. Check out this video of my changing the spark plugs in my 2006 matrix.
The gaps on these plugs is .04