Rapidly Dropping MPG

in the scangauge booklet, they describe how to calculate it for their unit. I believe its on page 15-16. just follow their steps and you should just input that number.

 

Both

 

I must have a different booklet. There's nothing on page 15, nor anywhere in my booklet, in reference to inputting any specific number.

How do you figure? One object traveling at two different speeds at the same time? If you're going 60mph, you can also be going 70mph at the same time?

 

I was saying the speedometer and odometer can be off by different %, which may not be answering your question.

I find my speedometer off by 6-7% while the odometer only off by 1.5%.

 

Great read. Could be the issue..