[Formula413]

Just a question for people running Scanguages. I have noticed that mine seems to be consistently wrong in measuring fuel consumed and mpg. It seems that I am consistently using about 5-10% more fuel than the Scanguage shows. As a result the gas mileage shown by the Scanguage is about 2 mpg higher than what I come up with calculating it the old fashioned way. Anyone have similar issues?

Also, does anyone know how the Scanguage measures how much fuel has been burned? I would think it must be using either the MAF sensor and/or the O2 sensor, but Scanguage cannot show any data from those sensors so I dunno.