One of my biggest questions throughout talks about emissions is how many of these truck engineers and epa folks have actually spent hundreds of thousands of miles in the seat of these trucks they design this emisson stuff for, or for that matter owned an emission truck? It seems like they havn't. They say fuel mileage has increased over the years, say that to someone that owns a newer emission tractor and see what they say, not to mention the extra cost of emission equipment up keep (urea injection, dpf cleaning or replacement, ect). Im not trying to be a dick when i say this but you can throw out all the "research data" you want but it just doesn't seem to line up with what you hear the actual drivers say, and this is coming from someone who drives, and my father, mother, step father, and many friends all drive for different companys, with a very diverse selection of trucks, and that haul much different kinds of freight. Now i know there is a lot of BS that comes from truck drivers but mention emissions and see how serious the talk gets.
For example we have a variety of trucks at work, from sterlings, to international, to a peterbilt. Okay our peterbilt 379 is one of the most un aerodynamic trucks on the road and even worse has a 10 speed with 3.30 gears but our truck consistantly gets 6 to 7.5 mpg grossing 75k to 80k from kernersville to wheeling il and back at the same weight. Specs are 1997 pete 379 exhd, 3406e cat 600hp, 10 speed, 3.30 rears, 63" unibilt sleeper. I know its very hard to compare two different trucks but i havnt heard of many newer emissions trucks that have much better aerodynamics than a 379 coming close to that.
I am not for killing the enviroment but the government (epa) has to find a "happy median" here or they will end up really hurting the transportation industry. Its hard enough for someone with a truck(s) to make it now with the price of freight, and fuel, but now the added expense of urea everytime you fill up. On top of that the downtime from the problems that happen that lead to the emission system on the trucks. My dads company has purchased new volvo's in the past few years and he has senority so ofcourse he gets the new truck first, and we have spoken many times on this very topic, and everytime he says that with each new truck he gets it seems like they spend more time down than trucks before and 9 times out of 10 its due to emission equipment. I just consider myself lucky that i work for a man that will not purchase anything newer than '05 so we dont have to deal with the emission, atleast till our fine government starts mandating it, at which time my boss says he will sell the trucks and leave the industry all togetherand i bet there are more than a few drivers and owners that feel the same.