You might be able to make two hard metal pieces that make a rectangular dent (for the zip-tie head) and punch a slotted hole (for the zip) in an aluminum washer in one step. Mount them in a shop press-tool and there you go.
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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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