With all the guages, bells, and lights already in the dash that try to get your attention when the fuel is low I have to suspect that you will ignore whatever device is invented to remind you to refuel.

Why add more cost to a new car/truck, they are already going up more than $1,000 per year--why not do it the cheap way watch gas gauge and/or low fuel light a lot lot cheaper and they already are in the car/truck.

Stay off of cell phone so you do not miss the turn into the gas station--plus you will will be a safer driver on top of that!

You have a low fuel warning system in your vehicle already- IT'S CALLED A GAS G-A-G-E! ! ! ! !

Some vehicles even come equipt with a low fuel warning light(gee wiz!). Maybe a biometric warning system for our bodies to let us know when we get near a restroom for when we really hafta go,too! Good grief!:-):-):-):-):-):-):-)

OOps I meant to spell "G-A-G-E" like this "G-A-U-G-E" instead. Anyway, hey, keep on brainstorming even the most famous inventors, great thinkers, etc. didn't come up with great ideas too quickly. Just think things through as much as possible first then post then you won't get as much heck!!:-):-):-)