That does a couple of things for you: it keeps crud and (heavier) water out of your fuel injectors and pump. This is, in aviation terms, "Unusable Fuel". These make it impossible to use the very last fuel in the tank. You'll also find some funny baffles around the pump inlet. It creates high-pressure fuel (300 KPA/45 PSI or so) to supply the fuel injectors. Open up a modern fuel tank and you'll find an electric pump in there. The top half is larger due to "Unusable Fuel" It must be liquid or the injectors cannot correctly meter. The engine simply cannot use gaseous fuel. You can't get better MPG with a full tank. However, it also makes you feel like you aren’t immediately burning through that tank of gas you just shelled out 40 bucks for (even though you totally are). Partly this is because it gives us the illusion that we are either getting better gas mileage. Similarly, it apparently makes us feel good to have the needle sit on “F” for longer. Engineer Phil Pierron, talking to Autoblog, said that customers, through surveys, have told automakers that we don’t actually want to run out of gas when they hit “E” - apparently, we like having the reserve so we can panic and drive gingerly to the closest gas station. With modern technology, we have the ability to tell exactly how much gas is left, but we don’t. So the top half of your gas gauge isn't measuring 50÷, but e.g. Therefore most car fuel gauges these days leave ~50 km as a buffer after the gauge reads empty and 15-25km before the indicator moves from full on a full tank of gas. You are being fooled by the psychology used by car manufacturers, who've discovered that A - if the gas indicator doesn't move for a while after a full tank, it makes the driver think the car is more economic than it is and B - if empty means empty, a lot of idiots will get themselves stranded.
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