Someone else's quote, sorry, I didn't think to save the name:
Quote:
Clearly, there is a HUGE environmental gain coming from this program. Do the conversion from MPG to Gallons per Mile (GPM), which is far more telling: GPM - The MPG Illusion
Much easier to calculate lifetime cost with that. For 100k miles:
15 MPG = 6667 gallons
18 MPG = 5556 gallons*
22 MPG = 4545 gallons*
28 MPG = 3571 gallons*
40 MPG = 2500 gallons
66 MPG = 1515 gallons
200 MPG = 500 gallons
So the environmental benefit from upgrading from 18 MPG to 22 MPG is the same as upgrading from 40 MPG to 66 MPG. Of course improvements at the low end are much cheaper, so if you want to provide an incentive for purchases, that's where they need to happen. They probably should have set the minimum higher in the 20s, but at least some of the most egregious cars will be off the road and people will likely voluntarily buy more efficient cars.
Just remember, though, that 18 MPG is the maximum that you can trade in - there are people with even less efficient cars. 15 MPG uses 6667 gallons for 100k miles - so upgrading 15 MPG to 18 MPG brings more in savings than going from 66 MPG to 200 MPG.
*The range at which the program is most tightly targeted with incentives and rules. $3k trade-in for a 4 MPG minimum saving, $4.5k trade-in for a 10 MPG minimum saving between the old and new car. So commonly a "lifetime" saving of 2000 MPG per 100k of driving. With gas at $2.50, that's a saving of $5000 in fuel costs for the 100k. The CO2 emissions for that 100k would be cut almost in half, that's a very significant saving all at once on a high emitting appliance. So if many cars are changed over because of this porogram, the entire program would probably make a perceptible difference in US emissions savings.
Lastly people tend to grossly underestimate how their own and other people's health is affected by car pollution, and how many productive working days are lost out of the economy due to the same. Cancer, hormonal problems, headaches/migraines, asthma attacks... It's an "invisible" problem. Even if many "true" clunkers don't get taken out by this program, the significant cutting of car exhaust in general by almost half from these particular drivers, will be beneficial to families' health and the economy in a way that might not be appreciated. Thus will also take a bit of pressure off your medical system, too.
Edited, Aug 14th 2009 9:16pm by Aripyanfar