It's hard to quantify the results, but i think mine is giving 100-200% annual returns. Which is much better than for example, my LED DRLs which only give ~33%, which is still a lot better than the stock market or a bank account.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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