You have the factory standing behind the certified pre-owned car, plus you'll be buying a car that the original manufacturer has inspected to ensure that it is worthy of certification. The only downside to certified pre-owned cars is that they are generally more expensive than other used cars.ot all used cars can qualify for certified pre-owned programs, and terms vary from one brand to the next, but any true certified pre-owned program will include at least a 100-point inspection of the car. If problems are found, the factory-trained technicians will fix it or disqualify the car from the program.
hydrogen is flammable yes, but not very. because it is the least dense element it disperses very quickly meaning if it were to leak out of something it would disperse before it could ignite. It also burns very fast and has a higher ignition temperature than gasoline (gasoline is between 228 and 500, hydrogen is 550).
Gasoline has a flash point of about -45 Â°C. The flammable range of a liquid is the ratio of the flammable liquid to air that would create a volatile mixture. The flammability range of gasoline is between 1.4 and 7.6%. If the ratio of gasoline to air is less than 1.4%, then the mixture is to thin to burn.