I was just thinking-wondering?

g1g wrote:
Is there anything that we can buy that would actually save us money?


example replace a real dirty air filter will give us better MPG, but how long far do we have to drive so the better MPG out weigh the cost of a new filter. LED lighting uses less juice but with the high cost I calculated it would take me 22 years to save over a CFL in my brick & stick house

So in short what are the best saving purchases that we can realisticly see a savings in the shortest payback time?

Its not just the cost of lost fuel mileage. A new or rebuilt diesel engine costs many times over what an air,oil or fuel filter will cost.

As for lights, the payback may be there by leaving some of the environment for our children and grandchildren.