Still, with interest, $6k/a is like $100k by the time you are ready to settle into a home and start a family. And by then you might regret letting it all (literally) go up in smoke.
I think before you start modding the truck you need to catch up on your
mrmoneymustache.com for a different way of seeing things.
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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)