[trebuchet03]

Originally Posted by theunchosen

I mean they are two ways to reduce emissions, grams per mile(g/Mi) or increase FE(which relates because (Mi/gallon)*(g/Mi)=g/gallon so if I decrease the number on the bottom the number on top also gets smaller.)

Are you sure you don't work for NASA? They too are classically known for going fubar with units.

We're talking about a standard... Your car MUST meet these standard. It doesn't matter weather or not your car consumes 10 gallons or 8.75 gallons because you're only permitted, by the standard, X grams per mile. "Gallons of emissions" is not a unit used by any standard I've seen. Furthermore, grams per gallon does not statistically control the variation in fuel economy ratings for cars. Using that sort of unit would be a perfect loophole for gas hungry vehicles akin the relation between SUVs and farm equipment taxes.

So lets say you've got a Bin 5 vehicle that gets 40mpg. You're permitted .07 g/mi of NOx.

Now lets say your friend also has a Bin 5 vehicle, but it gets 18mpg. It too is permitted .07 g/mi.

Both of those vehicles are permitted the same output.


Now if you really want to bring in gallons of fuel.... You can by recognizing the 18mpg bin 5 vehicle is going to need more "robust" emissions controls to meet the standard.

so if I decrease the number on the bottom the number on top also gets smaller.)

I can hear the extended high pitched "noooo" from my old high school physics teacher.... the numerator and denominator are independent of each other.... Otherwise it's recursive, dependent on each other and not solvable.

In saying that if we take my 1.5 liter power plant out and drop in that v12 I promise you my grams/mile goes up.

Please, stay focused.

If your engine is consuming less fuel then it is producing less of those emissions

Fallacy
Small scooters are great at sipping fuel - but when some were tested, show terrible terrible emissions.

This is the whole reason why we use grams per mile as the standard metric. It statistically controls fuel consumption. I should ask (and I don't mean any insult), do you understand what a statistic control is and why it's important? I ask because your posts and units don't control these parameters....