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Wild MPG instant reading

15980 Views 39 Replies 13 Participants Last post by  GDE, 
ECO33
Was in heavy traffic for about 1 hour on I 5 goin south through Tacoma WA today for about 10 to15 miles or so and the reading would go from 0 standing still to 99 As I crawled along one or two mph, then down too 25, up down and even when I got out of the slow traffic it was still bounceing up and down. When I got too my destination I cleared all the readings and it would still do it as I moved the truck to park it. It run good other wise and drove fine, it started right up three or four times after I had it parked. This is a 360 mile trip over and the same going back so hope it runs fine when we head back Saturday. Do you think I should see if I have it checked Friday before I head back to Eastern Washington :(
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It just depends on if the reading is instantaneous or if it is averaging out your mpg over a certain period of time. If you think about it, coasting doesn't use any gas so it makes sense that it would read 99 if you are coasting.

I'd experiment with a bit and if you still feel like you are getting poor readings, then I would take it in to have someone look at it.
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