jb904 Posted March 7, 2009 Share Posted March 7, 2009 my 98 ls400 had its check engine light come on. I havent been able to find out what it means just yet but since its been on i havent noticed any change in how the car drives. i drive in the city but im easy on the pedal driving like granny and my display is showing 20 mpg average. however after filling up my car recently i did the math (total miles driven/gallons filled) and the actual mpg is 14. If my display is somehow off how would i fix that? Or is it a chance that the check engine light is causing the misread for the MPG? Quote Link to comment Share on other sites More sharing options...
Budhah Posted March 8, 2009 Share Posted March 8, 2009 my 98 ls400 had its check engine light come on. I havent been able to find out what it means just yet but since its been on i havent noticed any change in how the car drives. i drive in the city but im easy on the pedal driving like granny and my display is showing 20 mpg average. however after filling up my car recently i did the math (total miles driven/gallons filled) and the actual mpg is 14. If my display is somehow off how would i fix that? Or is it a chance that the check engine light is causing the misread for the MPG? Sounds like someone siphoned a few gal of gas from your tank.. On some of the older models the gas door is easy to pry open. My suggestion is to double check it for a month or so.. Easy,, just drive 200 miles or there about, and see how close you get to 10 gal of gas. Quote Link to comment Share on other sites More sharing options...
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