John Ferrell wrote:
www.scangauge.com
>I am still reading but this looks great!
> If anything, it looks to good to be true.

There are generic PIDs for things like fuel pressure, airflow, etc. There 
was an article in Circuit Cellar a while back about a fuel consumption 
gauge, it was extrapolating the amount of fuel from the airflow:

http://www.circuitcellar.com/advertise/cc-advertising/Lightner-183.pdf

There's also a PID for vehicle speed ($0D) that, multiplied by the time 
traveled, can give you an approximation of distance traveled.

So it's not as difficult as it may seem, there's only one catch: the car has 
to be OBD-II compliant. This article explores the issue of OBDII compliance 
in depth:

http://www.scantool.net/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=2&nav=0

Best regards,

Vitaliy 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist