I realize that fuel is set to custom...but really? Save your explanations and what not and just admit you all cringe every week as fuel skyrockets. If the system is going to be worse than historical prices, which it is, then custom fuel prices are really no benefit and the competitive edge this factor adds to the game will be void when everyone goes bankrupt when fuel reaches $1000 a barrel. Let's have jumbo's fuel consumption set to custom and burn say, 3 gallons per hour? Just a small gripe, I love this game.
The "benefit" of custom fuel prices has absolutely nothing at all to do with making them low. It has to do with making them unpredictable. That's the entire reason the feature was implemented.
The game is rated "Easy/Medium", so I'm sure fuel prices won't be getting that high and certainly not for that long -- fuel pricing is the primary determinate of difficulty, so I'm sure sami's got it set rather low. Prices over $1000 aren't at all uncommon in the game and it isn't until things approach $1500 where people have problems. Just remember to keep your pricing updated. Default pricing adjusts to consume a large percentage of the fuel price increases. As long as you keep your default pricing going up, high fuel pricing really isn't that hard to deal with until, as I said, it surpasses $1500.
And remember, the price displayed isn't "per barrel", so don't think because it says "$1000" it's way outside the realm of reality. The price displayed is "Per 1000kg" -- which is WAY more than a barrel. Divide the displayed price by a factor of about 10 to get what it would roughly be "per barrel".