how accurate do you find the mpg indicator?

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Bartok - 27 Aug 2008 17:34 GMT

How accurate do you find that mpg indicator? Mine resets every time I put
any amount of gas in the car. What mechanism or technology is being used to
measure the consumption? The mileage seems good but i don't know if i trust
it.

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njbok - 27 Aug 2008 19:19 GMT

I've figured mine manually several times on my 2004 LS and compared the
results with the indicator - It has been perfectly accurate every time.

I'm amazed. I figured it would be in the ballpark, but never thought it
would be accurate every time. I can't imagine how they do it, but I'm now
confident enough to rely on it. It's a great system (whatever it is).

> How accurate do you find that mpg indicator?

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St. John Smythe - 28 Aug 2008 02:17 GMT

> I'm amazed. I figured it would be in the ballpark, but never thought it
> would be accurate every time. I can't imagine how they do it, but I'm now
> confident enough to rely on it. It's a great system (whatever it is).

The ECU knows just how much fuel is being metered into the engine, and
how far the car has driven. Probably the biggest inaccuracy would be
from tire diameter changing with wear or inflation.

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sjs
2003 ES300

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kitzler - 29 Aug 2008 15:40 GMT

My friend's 2005 Avalon's trip meter indicates the exact mpg to the
tenth, however my GS300 2006 trip mileage meter is off by exactly 1.5
mpg, consistently too high, I might add. It is no sweat, as the miles
left is always conservative and I have never gone below tw gallons
left in the tank, I always chicken out...... (sigh)

It is incongruous that Toyota's software is better than its Lexus
counterpart, unless of course the fuel metering sensor is totally off,
but then why the consistency in its calculations.

/N

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