By: orange 4 boy

orange 4 boy — Tue, 07 Jul 2009 00:31:33 +0000

I realize, of course that even if my analysis of your experiment is correct your point is still valid that “real world” fuel economy numbers must be taken as error filled data, not hard evidence.

By: orange 4 boy

orange 4 boy — Tue, 07 Jul 2009 00:23:00 +0000

On your alternator test, there are some variables which may have influenced your outcome. I can give you an explanation for your results which may explain them. This is of course only a logical guess which would need a follow up test with consistent voltage. Tell me if I got anything wrong here.
On your lower than expected 2nd result from taking off the belt:
First, if your voltage was not kept around 14V then your fuel pump may not have been up to stock pressure, reducing the vaporization of fuel and thus FE.
Second, the spark may have been a lower voltage and temperature reducing the efficiency of the combustion from stock.
On the last result, when you reattached the belt, the alternator began charging the now partially discharged battery making the parasitic load higher than the first result where, I’m assuming, the battery was fully charged.
Sound reasonable?

Comments on: One Big Reason Not to Trust “Real World” Fuel Economy Testing

By: orange 4 boy

By: orange 4 boy