True, although a little ponderous. They would allow "carbon mass fraction of 85%" although not their favorite expression. I mostly try to follow them but some of their expressions just don't roll off the tongue (or keyboard).
Back to the article, I had left a comment that they were using Imperial gallons and the figure was misleading in a US article. It sat in a moderation queue for 1.5 days. Sometime last night, they wiped it, so they would rather not know they were wrong or let anyone else know. ________________________________ From: James Frysinger <j...@metricmethods.com> To: U.S. Metric Association <usma@colostate.edu> Sent: Thu, April 25, 2013 1:20:55 PM Subject: [USMA:52701] RE: Oops: Imperial or Customary? > Both diesel and gasoline are about 85% carbon w/w A better way to express that, per NIST SP 811, would be "Both diesel fuel and gasoline have a carbon mass fraction of 850 g/kg" or ""Both diesel fuel and gasoline have a carbon mass fraction of 0.85 kg/kg". Jim On 2013-04-24 17:45, John M. Steele wrote: > 1) Monroney sticker requires CO2 in grams per mile. It is normally not > used in advertising here. It is largely a waste of space as it can be > accurately caklculated from fuel economy data: > *44 g of CO2 requires 12 g of C in fuel > *Both diesel and gasoline are about 85% carbon w/w > *Density of gasoline around 0.74 kg/L, disel 0.84 kg/L > (the 2nd and 3rd assumptions can be replaced with better data if available) > 2) Evidently > > ------------------------------------------------------------------------ > *From:* Martin Vlietstra <vliets...@btinternet.com> > *To:* U.S. Metric Association <usma@colostate.edu> > *Sent:* Wed, April 24, 2013 4:57:56 PM > *Subject:* [USMA:52692] RE: Oops: Imperial or Customary? > > Was this written by a journalist? If so > > 1.They probably do not know how to convert g/km to oz/mile (is that what > is used in the US) > > 2.They are probably unaware that the UK gallon is larger than the US gallon. > > If on the other hand it was written by an advertising person, it might > well have been convenient to “forget” about the difference between the > UK and the US gallon. > > *From:*owner-u...@colostate.edu [mailto:owner-u...@colostate.edu] *On > Behalf Of *John M. Steele > *Sent:* 24 April 2013 15:48 > *To:* U.S. Metric Association > *Subject:* [USMA:52689] Oops: Imperial or Customary? > > US website "borrows" report from UK website on how green the Ford Fiesta > (diesel) is: > >http://usdailyvoice.com/ford-fiesta-hyped-by-u-k-website-as-top-green-car-of-the-year-1958.html#comment-395 >5 > > "According to official (metric system) figures, the 2013 Ford Fiesta’s > emissions are now at only 87 g/km carbon dioxide. This would be for the > 1.6-liter diesel variant, which is also capable of 85.6 miles per gallon > in the combined cycle," > > The CO2 figures make it look like the mpg is proabaly Imperial, and > Googling for the original UK source, they use the same figures which are > unlikely to be based on the US gallon: > >http://www.thegreencarwebsite.co.uk/blog/index.php/2013/04/23/top-green-car-the-ford-fiesta-the-green-piece/ >/ > > So he manages to change British "litre" to American "liter" but not to > fix the gallons. He should have gone with L/100 km. >
