You don't want much
The 10L/100km you are currently enjoying is quite low fuel consumption and will only increase if you use a stationwagon with a load in the back.
I would biff any luxuries, ciggies, alcohol, sweets, presents for the mrs, pies etc and buy more fuel, then hunt more.
Luxury food and cigarettes/tobacco and any form of alcohol can be the biggest personal misappropriation of money you will ever see in your lifetime, these three thin the wallet whilst lulling you into accepting the process and consequences.
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