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1st Gen prius Millage?

6K views 5 replies 6 participants last post by  rand.soper 
I'm concerned though as mixed driving today on a fresh tank of gas yielded only 40mpg. I may replace the O2 sensor next.
Making changes based only on a perceived difference in fuel efficiency over a short time like that is usually not a wise thing to do.
Give it a little more time.
A 3 MPG difference can be caused by external conditions and measurement "error". Hot weather and running the AC more can account for 1-2.
 
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