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For venctonomy. Extra 10 liters or 8.4 kg in the tank increases fuel consumption about 0.3% to 0.6%. Difference in diesel price between various stations can be easily over 10% at least in Finland. Calculate which saves more if you can drive over 200 km more and the cheapest station happens to be on your way... So you are able to get to the cheapest station more often than with "smaller" tank.
If the cheapest station is next to you it does not help so much, but even then you can do longer trips without the need to fill in at those more expensive pumps.
And yes Geo Metropolis I think your theory works just fine.
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