Really it worked for me, it was around up to 25 miles I drove but car was going on. What I have noticed,it’s my observation if your car’s tank is 21 gallons, usually light turns on 19 gallons. So you still have 30 to 35 miles to use depending upon you car mileage use. Whenever I fill the tank it’s usually 19 gallons and I read it in car’s manual it has a 21 gallon tank. So it has always two gallons in reserve.