Miles Per Gallon Equivalent by Four Different Methods

[roflwaffle]

Originally Posted by RobertSmalls

I live near a hydro plant. But if I conserve electricity, the hydro plant can sell its CO2-neutral electricity to someone in New Jersey who would otherwise be buying from a coal-fired power plant.

If that's the case then it will show up in the Carbon intensity per kWh, but either way we're still going to see a lot of regional variation.

[bwilson4web]

Perhaps the goal of the MPG sticker is operational cost, the $/mile. If someone is buying a new car, they can see the list price and understand what they will be paying +/- negotiation. The MPG simply provides an estimated $$/mile, not perfect but no worse than the MSRP sticker price.

I appreciate the exercise and subtleties but in the big picture, information about the impact on family budget comes first.

Bob Wilson

[NeilBlanchard]

Issues with Watt Hours per mile are that most people have no idea what a watt hour is; and the lower the number is, the better.

Maybe we should put the average powertrain efficiency? I.E. ~18% for ICE's and 85% for EV's. Or, both the average and the peak efficiency? I think most ICE's peak around 30-32%, while EV's can peak at ~90%.

By the way, in my xA with most of my grill covered, it still takes 4-6 miles (depending on the season) to come fully to operating temperature (184F), so I'll bet the efficiency during this warm up time is less than 10 or 12%? For an average drive (less than 20 miles), this means as much as 1/3 of the drive is lower than 18%.

[JasonG]

MPGe really doesnt work and should not be in the "Top MPG" list.

how would ya'll feel if I listed my buddies sled dog team ? I can calculate the 2.3L per Hr they put out times 6-8 dogs at X MPH. Would that me MPGe ?

Or if I added a scrubber in the bed of my truck it would cut my CO2 output by 90%, could I claim 160 MPGe ?

I personally would feel I was lying just to make my numbers look good. Havent we had conversations here before about lowballing EPA #s on vehicles that dont have them just to have higher %s over ?

Let's all be adults here and drop the MPGe stuff.

KWH/M is KWH/M
MPG is MPG

[NeilBlanchard]

MPGe does not indicate anything to do with carbon dioxide output. It is an energy equivalency; not a pollution or carbon footprint comparison.

It uses BTU's -- which is the one thing that Matt left out of his chart...

[JasonG]

So if we are comparing BTUs, do we add a 1.89 correction factor for alcohol ?

An active person outputs 1000-1300 BTUs/hr, so is there a MPGe for HPVs ?

Comparisons can be a slippery slope.

[NeilBlanchard]

The X-Prize MPGe spreadsheet is based on E10, I believe.

[dcb]

the xprize MPGe is crap

[gone-ot]

Originally Posted by dcb

the xprize MPGe is crap

...true (or not?), but at least it was an agreed-to, standardized, equivalent for the time being.

[dcb]

I never agreed to it