Anybody knows who has the biggest fuel tank (http://www.carpartswholesale.com/cpw/fuel_tank.html) capacity of all the trucks available in the market right now? Thanks.

Large trucks typically have capacities ranging from 5,500 US liquid gallons (20,800 litres) to 9,000 US gallons (34,000 litres).

However, everyone's concern with the Prius fuel gage and tank capacity is correct - I have the same problem.
Is each 'box' or square on the fuel meter suppose to be one gallon, or some other number? Or, just an indicator? This morning, I filled up first at 8.8 gallons, then added up to 8.9 gallons, and then 9.0 gallons before I got tired of trying to top off the tank.
The dealership also never told me about this issue, but it must be going on since at least the 2004 model. It would benefit Toyota's reputation for honesty if they did note that the 11.9 gallon capacity varies with temperature, and to refill the car when people hit that last square on the fuel indicator.
Most of the time, you can go about 415 miles or so between fill ups, with 'normal' Prius driving. But, just like it's mentioned above, when you get close to the empty side, just go ahead and fill it up anyways - no need to push the limits of the tank.
FYI - when the fuel pump sucks up the last bit of fuel in a tank, sometimes the "bad stuff" that is in fuel (many tiny bits and pieces of anything from the time the oil is made into gas, until it reaches your car) get sucked into the fuel pump and filter. Now, 99% of this stuff is either filtered or burned away, but sometimes it will adversely affect your fuel pump's performance, and other system / engine components. This may eventually cause the overall MPG average to begin to drop because of fuel system degradation.
Best thing to do - keep in mind when you get to the last box or 2 to fill up. It will still cost you a lot LESS then driving a SUV or big truck! I only paid about $30 for my fill up this morning at $3.54 per gallon. If I had my 98 GMC Sierra with about 24 gallons to fill up, I would be paying something like $80 or more every 5 - 7 days.

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