If I fill up the tank in my car, the car weighs more and it takes more gas to move it.
If I keep the tank near empty, the car is lighter, but the rate of fuel evaporation in the tank increases.
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Just get rid of the gas engine all together and convert it to all electric and you won't have that problem!
Don't complain.
Something like 3,500,000lbs of liquid fuel to launch just 50,000lbs of payload.
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Newer vehicles have a internal bladder nearly eliminating gas vapors in the tank.
Hrm...I've got an internal bladder...but I still seem to have a problem with those gas vapors...perhaps it's my diet.
Unless it's an old old car you lose nothing to evaporation. All newer cars have sealed tanks. In my state (Maine) Part of getting an inspection sticker is a test to confirm the tank is tight with the cap on. My new Honda throws an idiot light if the gas cap is loose.
I do not know how air get's into the tank as gas is used.... but it must!
I believe that most cars have the fuel tank "breathe" through a charcoal cannister. The charcoal acts like a sponge and captures vapors that are emitted by the fuel warming in the sun, and the warming fuel expanding, which pushes tank air out.
Then, when the engine is running, the intake draws a trickle of air through the cannister to burn up the vapors and "empty" it.
My 2000 Nissan threw a "check engine" code until I replaced a fuel cap that had been lost for a few days.
Don't worry about fuel loss due to evaporation, its very tiny. But, if you want to obsess about something, fuel is about 8 pounds per gallon, so carrying 8 gallons instead of 16 will save you 54-ish pounds of dead weight.
Air up your tires, accelerate and de-cel gently, and travel at about 5 MPH under the speed limit to reduce air resistance. Double the speed is about 4 times the resistance. Use synthetic oil.