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In dash mpg display accurate?
Hey everyone, just recently joined the forum but I've been reading alot over the past few weeks.
Anyways, one of my first questions is: How accurate is my MPG display that I have on my Volvo's dash? It has both realtime and cummulative displays. I would think it should be pretty good. I have stock sized wheels/tires on the car so it knows the distance I'm traveling and amount of fuel its using.
If it is accurate, what benefit would I have in purchasing a scanguage?
Thoughts?
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Garrett76zt 
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