Boston's population density is 2200 per square mile or 800 per square kilometer. Also, perhaps surprisingly, Philadelphia is the least dense urban area in the world with more than 5 million population, while Chicago is the least dense urban area of more than 7.5 million.
Cargo fuel tanks shall not exceed 150 gallon capacity per vehicle. Vehicle transporting fuel in cargo tanks of 115 gallons or more shall display either a hazardous materials placard indicating identification number NA 1993 for diesel fuel or a placard indicating 'Fuel Oil'. When empty, the placard shall not be displayed.
Each jurisdiction determines which types of fuel are considered special fuels, and sets the tax rate for each type of special fuel. In New Mexico, diesel is the only type of fuel considered as a special fuel to be reported on IFTA returns. However in Texas, gasoline and diesel are special fuels and both types are reported on IFTA returns.