Very sorry to see the damage to your rear bumper
.
Agree front end is terrible for stone chips ... after 10k miles mine looks like it's been sandblasted in places
. I'm expecting to have to get it resprayed every 18 months or so if I want to keep the chips under control.
And yes ... the tank/gauge is totally non-linear. First half takes most of the time, then the next quarter is a bit faster, and the last quarter goes in a matter of miles.