In an earlier post (3/26) I documented the poor mpg that I was getting ( 26 mpg on 2 fill ups)
I purchased a "Scangauge" that measures things like mpg, engine temperature etc.
It is described elsewhere these forums and on
www.scangauge.com
Using the scangauge, I have pretty much discovered the circumstances that cause this poor gas mileage.
If I get in the car when it has been sitting overnight or for a long time, and make my usual 2 mile drive, I get about 26 to 28 mpg and the engine temp ends up at about 150 degrees. If I drive it for a few more miles so that the engine temp levels off at about 185 degrees and then repeat the 2 mile drive, I will get about 40 to 42 mpg. This is very repeatable.
So the problem seems to be that the smart is using too much fuel (too rich a mixture perhaps) when it is not completely warm. What I don't know is if this just the way that the smart fuel system is designed or is my smart out of spec?
Has anyone else that has a scangauge for their smart, seen the same behavior. Is there any other scangauge? measurement that I use to further diagnose the problem?
John