A car can use more gas than usual if it has been skipping service after certain milestones. A messed exhaust and a faulty fuel injection system will also lead to increased fuel consumption.
Possibilities:Higher proportion of ethanol in the fuelA lot of extra weight in the vehicle
Could be many reasons, I would start with a complete tune up.
Cars will use more gas idling than starting the car.
Regardless of what the fuel gauge says, are you having to fill it up more often than usual? It may be that the gas gauge float mechanism is out of order -or- if it is actually using more gas than in the past, you may be driving with a heavier foot than usual. Of course there is always the possibility that someone is siphoning gas our of your tank.
yes
The larger the car, the more gas it needs to go anywhere
It is the car running too rich. or the car is using more gas than air.
yes
It will make your car use more gas than it should
F1 tyres are filled with Nitrogen since it is a more stable gas than air
More. If the car got a really poor 10 miles per gallon, it still would travel 150 miles before running out of gas.
You might lend your car to your friend. If that will NOT happen use all the gas before you go so if someone does steal it there will not be any gas to drive the car.