> green for still driving my '97 automobile ? ....I just got 22 MPG
Driving a 1993 Chevy here. Gets essentially zero MPG. (Plow down, back up, plow down, back up,.....)
That's 6,000 pounds of steel and other highly cooked dirt (glass is well cooked sand, the alloy tranny is well-juiced bauxite...). Think how much ENERGY it takes to dig and move red dirt and coal to cook pig-iron, more energy to roll or cast it....
A new truck would probably never save as much energy as it takes to make it.
(Much steel today is re-cycled from old cars/trucks, not cooked from red dirt; but it is still a LOT of energy to re-melt 6,000 pounds of scrap, and the rest of the process is the same.)
> the USPS vehicles. Those all too familiar red, white, and blue delivery trucks have aluminum bodies (on a GM chassis), poor gas mileage, and are about 20 years old
Some are well over 30 years old. (And still have the oomph to take out my mailbox....)
The idea was good. Especially if you knew the Post Office vehicle before it. I had a 1972 ex-PO van. The PO was selling these off in 70,000 miles fairly cheap, for good reason. Mine was a Ford Bronco frame. 2WD, the front axle a piece of pipe instead of a pumpkin. The front suspension arms were trashed. The transmission had been overhauled already (I paid more for this one, others were slippy.) The 300CID Six was peppy after I traced-out a Holley carb to replace the work MotoCrap jug. Roof leaked all over, doors stuck--- it was very tired for its age.
The fairly short life of this series (and earlier ones) is why the PO let the contract for the Extended Service van. I must say it filled its purpose. Dunno what is really under these things (I suspect ruggedized Citation), but the early ones are going-on 30 years. The one here squeaks like a frame-wreck and I do not stand in front of it cuz I don't trust the brakes, but it gets around in all but the worst (state-closing) snows.
UPS (the brown vans) has a serious vehicle procurement system. They admitted many decades back that vehicle service was key to their business. While based-on standard medium truck parts, much is UPS custom. The guy here recently got a new rig with slanty headlights, but before that he had a round-eye which was probably 30 years old and in excellent condition.