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- Jan 20, 2013
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Resurrecting an old thread, interested about the under 2l/100km bit, How do you know this. I find that if I pop it out of eco, on a known downward slope, floor it for about 2/3 seconds ( up to about 75+) then knock it out of gear, whilst tapping it back into eco,it does roll an increadably long way,
You can test the display by climbing to the top of the biggest hill you have, getting up to speed and resetting the MPG read out. At any speed above 30mph in 5th, the ECU will be in DFCO and not using any fuel. Touch the throttle at the bottom and the numbers will shoot up immediately. Conversely you could go to a race track where the MFD is maxed out at about half throttle, as soon as you slow down the readout drops from it's 25l/100km limit. I recorded around 23l/100km (12mpg) on track, but there's no way it was that good. You can also use OBD to give you relative numbers and you'll see the OBD average dropping far quicker than the MFD because 'zero' is a much more powerful number than '2' when your average is around 4. Currently sitting on an estimated 65mpg tank
In my experience the MFD will be ever more optimistic below 50mpg, and ever more pessimistic as you go above 50mph, it can be as much as 10mpg either way, although with a big enough hill the error could be massive.
The 500 is one of the worst coasting vehicles I have, light weight and worse-than-a-van aerodynamics means it coasts worse than a van. I suspect your Yaris brakes might be rubbing, as the two should coast pretty much the same. UFI coasts slightly better than a 1994 Suzuki Swift.
I have a hill I drive most days and use the lamp posts at the top and bottom to get a speed delta. UFI looses about 4km/h at the bottom, the Prius gains 4km/h