the U.S. federal government races to combat the shadowy and
indeterminate "global warming" threat, it is deploying stricter
restrictions which may have a serious impact on both consumers
and the business sector. Unsatisfied with consumer vehicles obey
fuel efficiency standards, the U.S. Environmental Protection
Agency has now announced a proposal to regulate, for the first
time, the greenhouse gas and fuel efficiency of heavy
vehicles.Heavy vehicles are defined as a vehicle with a gross
vehicle weight at or above 8,500 pounds. This includes some
heavy-duty trucks, large vans, commercial trucks, and tankers.
The majority of consumer vehicles -- even beefy ones like the
Hummer -- are well under 8,500 pounds.The new restrictions,
according to the current plan, would be broken down into
vans/trucks whose emissions and fuel efficiency would be
measured in gram per mile and gallon per 100-miles; and
vocational vehicles/combination tractors (e.g. commercial
trucks, tankers, tractors) whose emissions and fuel efficie