It's accurate once it's calibrated, but it's relatively accurate even before that- higher numbers, whether or not they're "real" are higher than lower numbers.
Gearing can leave the engine at its most efficient spot, and steady cruising doesn't put too much load on an engine, especially on something aerodynamic. My Fit does best between 40 an 50 mph because it's a brick.
Calibrate it at every fill up for a while, and the numbers will get more accurate and you'll be able to believe the screen a lot more.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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