The amount of petrol left after the fuel light comes on varies by make and year of car. The reserve tank on most vehicles holds about 1.5 to 2 gallons of petrol or gas. To estimate the miles left a person needs to know the miles per gallon of the car.
When the petrol light comes on in most cars there is enough left in the tank to get to a petrol station, which is around ten or fifteen miles worth. So lets say a fiesta does 40 mpg, that would mean 1/4 of a gallon or around a litre of petrol.
500 miles is always 500 miles unless it's nautiical miles. I'm not sure if 500 miles in petrol would be classed as nautical miles.
It depends on the cost of said petrol and the efficiency of the vehicle in "miles per unit of petrol". You didn't supply enough information.
15 billion miles
In an average car, you would need about six liters of petrol to drive 38 miles. This is equal to about 1.5 US gallons.
300 dollars
To determine the cost in petrol to drive 232 miles, you'll need to know your vehicle's fuel efficiency (miles per gallon) and the current price of petrol per gallon. For example, if your car gets 25 miles per gallon and petrol costs $3 per gallon, you would need approximately 9.28 gallons (232 miles ÷ 25 mpg). This would result in a petrol cost of about $27.84 (9.28 gallons × $3). Adjust the calculations based on your specific vehicle's efficiency and local petrol prices.
From Cardiff to Glasgow is some 400 miles and would cost about £75 in petrol.
It would cost (2.4) times (the cost of one gallon petrol). Also, add cost of tolls, food, etc.
The light should be reset after each oil change. It is programmed to come on every 7,500 miles. I surely would Not exceed that.
The cost of petrol for 1 mile will depend on the fuel efficiency of your vehicle (miles per gallon) and the current price of petrol. As a rough estimate, if your car gets 25 miles per gallon and petrol costs $3 per gallon, then it would cost you around $0.12 per mile in petrol costs.
Personally the most I have had to drive once that is about 60 miles. so I would say close to that.