That was the case for a few years, but its turning back now. It used to be anything over 7500lbs was exempted from mileage standards, plus, they could be depre

That was the case for a few years, but its turning back now. It used to be anything over 7500lbs was exempted from mileage standards, plus, they could be depreciated faster on taxes if you owned a small business. that is why so many small business owners had a very, very large SUV. However the high cost of fuel has helped change that, and now the Suburban, and all 1/2 ton pickups are offered with a very small diesel engine (around 3.6L i think) that gets > 27Mpg.