Tudor Van Hampton Arnold fills up the tank, which is easy to do, but computing mileage is a chore. Tudor Van Hampton Due to the size of the fuel, experts say CNG (shown) is ideal for delivery fleets. LNG is suited to long-distance hauls. As a transportation fuel, natural gas has a lot to offer: It is cheap, abundant and clean. The downsides: lack of available pumps, less power and a higher up-front cost for the vehicle. These are hard to overlook, but fleets are doing just that in an effort to cut their fueling costs.Today, natural gas sells for
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.