Official Scangauge II Thread - Share your Data, Discuss Settings ,Problems, Findings! - Toyota Yaris Forums

jambo101 · 03-31-2014, 09:18 AM

As an instrument to measure MPG my Scangauge is useless and cant be trusted to give an accurate reading..

With a full tank of gas and sitting at the gas station I put in all the required parameters for setup in miles and gallons as the trip was entirely in the USA,also included an Xgauge setting to show me average MPG per day,went to the fillup and pressed DONE then off for a 2000 mile trip,MPG read steady at around 36MPG through the first tankful but when i refilled the tank with 8 gallons of fuel going to the fillup icon it said i just put 12 gallons in so i adjusted/recalibrated the 12 gallons back to 8 gallons and started off again but now the MPG reading was reading a steady 25MPG.Throughout the trip the amount of gas i actually put in got further and further away from reality and i saw fluctuations as low as a steady 10MPG to as high as 90MPG

The problem was probably my my fault but i cant figure out what i was doing wrong as the set up is quite straight forward and subsequent fillups should have read very close to the amount i was actually putting in the tank but in reality that fillup number just got further away from actual gas input..

Any one got an idea whats going wrong?
And can anyone suggest a less problematic MPG device?

Thanks

03-31-2014, 09:18 AM	#36
jambo101 Drives: yaris 08 sedan Join Date: Oct 2008 Location: Montreal Canada Posts: 1,286	As an instrument to measure MPG my Scangauge is useless and cant be trusted to give an accurate reading.. With a full tank of gas and sitting at the gas station I put in all the required parameters for setup in miles and gallons as the trip was entirely in the USA,also included an Xgauge setting to show me average MPG per day,went to the fillup and pressed DONE then off for a 2000 mile trip,MPG read steady at around 36MPG through the first tankful but when i refilled the tank with 8 gallons of fuel going to the fillup icon it said i just put 12 gallons in so i adjusted/recalibrated the 12 gallons back to 8 gallons and started off again but now the MPG reading was reading a steady 25MPG.Throughout the trip the amount of gas i actually put in got further and further away from reality and i saw fluctuations as low as a steady 10MPG to as high as 90MPG The problem was probably my my fault but i cant figure out what i was doing wrong as the set up is quite straight forward and subsequent fillups should have read very close to the amount i was actually putting in the tank but in reality that fillup number just got further away from actual gas input.. Any one got an idea whats going wrong? And can anyone suggest a less problematic MPG device? Thanks __________________ Have Yaris will travel..