The post trip fuel consumption calculator to calculate for the remaining fuel for AvGas and Jet A. Based on the tank fuel capacity, consumption rate and the trip timing the tool calculate remaining fuel available in the tank and the volume needs to be filled. Avgas (100-130 or 100-130LL) weight is calculated at 6 pounds per gallon; Jet A (jet fuel) at 6.84 pounds per gallon. The weights are accepted averages based on specific gravity and other variables, such as temperature and additives due to climate.