You linked the video, but not your site, which is weird.
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It reduces your fuel bill by ± 20%
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I really think that you wanted to say "It reduces your fuel bill by ≥ 20%." Also, your video states at 1:12 "The vehicle in the video is a diesel Hyundai H100 truck, initial range was 450km per tank now the range is 550km per tank. That is a 122% improvement."
550 / 450 = 122%. However, 100% is the baseline, so it is a 22% improvement, which is more or less what you state elsewhere.
Effectively, you state that this forces the driver to maintain the speed limit while they would use 20% more fuel speeding. Here is a MPH vs. MPG chart:
Prius v Versus Ford C-Max Hybrid: Comparing Real-World Fuel Economy
According to that chart, slowing from 70 MPH to 65 increases fuel economy by 13% and dropping from 70 to 60 improves MPG by 24%, so driving 10% slower results in ≈ 20% improvement.
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Research by one of the major car manufacturers has shown that driver behaviour influences fuel usage by up to 30%.
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Guys?
So, this is a rev limiter? I remember a suggestion on here about installing a block under the gas pedal in the wife's car. Yes, not speeding saves money, but I believe the common consensus on these forums is that accelerating at a greater percentage of Wide Open Throttle uses less fuel than accelerating slower, and then you spend a longer time at your driving speed.