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I'm pretty sure it checks every 30 seconds. The 13mpg could have been for numerous reasons, you can reset it every time...so if you clear it, then floor it, you'll see terrible mileage.
I reset it at the pumps to see what I avg per fill up. Driving out of the gas station in 1st usually has the read out showing 20+L/100KM (12+MPG). I wouldn't worry about it.
I currently get about 8.5L/100KM (27MPG) and I drive very "spiritedly" I always get really high up in 3rd and 4th gear on my way onto the expressway, I rev match all the time, leave my windows down, and accelerate very quickly.
It's really great for fuel economy. In spring, when it's neither heat nor AC weather, on a long distance trip in 6th gear, I'll get 6.5L/100KM @ 115km/h (36MPG at 70MPH).
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