One exception to note: If the food's sitting in an environment where the temperature is over 90Â°F, the USDA says the food should only be left out for one hour, so keep an eye on the clock if you're serving food on a hot day!
Estimated cost of hydrogen per kilogram in a variety of scenarios. With all of this in mind, here are the cost estimates per kilogram (which each include $1.25 for taxes): Hydrogen from natural gas (produced via steam reforming at fueling station). $4 â $5 per kilogram of hydrogen.
Hydrogen Fuel Cost. Current average prices are around $2.50-$3.00 per gallon of hydrogen fuel. As gasoline prices are somewhere between $3-$4 at the present time, this highly comparable. Taking the ratio into account, this effectively means that a hybrid car will achieve an average of sixty miles per gallon at $3.00. Comparing that to regular gasoline, the ratio is around 2:1.