Unfortunately your poll doesn't match my own experience, but what I have seen is a gradual increase over time, of a few percent here and there, that add up to 10 to 20% over a time frame that can easily span 1-2 years.
Because at least in my case it has to do with the car, I find I have to drive it the way it wants to be driven, which means I have to allow the car to guide me towards the most efficient methods...
This, unfortunately, varies from one vehicle to the next.
I find I have to study it, and measure constantly, and make minute adjustments (and some not so minute) and keep doing that, just keep doing it.
So it always takes time, and it is a gradual and never-ending process.
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A FE gauge should be standard equipment in every vehicle.
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