The truck uses 0.1G/mile and the car 0.04G/mile, the difference is 0.06G/mile.
At $5/G you are saving $0.3/mile.
You'll get you money back after 3000/0.3 = 10000 miles.
At $4/G it'll take 12500 miles.
Making cost calculations difficult is the main drawback of using MPG instead of GPM.
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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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