I had someone call this article from SAE Automotive Englineering International to my attention. http://www.sae.org/mags/aei/10189/ Quoting one paragraph: "At road speeds of 80 kph (50 mph), the claimed efficiency gain is 12%. It increases to about 7% at 130 kph (81 mph). Reduction in fuel consumption is achieved after three seconds or more. " "Kph" is not allowed in the SAE metric practice guide SAE TSB003 and I commented to the editors: I would like to comment on this article at http://www.sae.org/mags/aei/10189/ and particularly on the paragraph: "At road speeds of 80 kph (50 mph), the claimed efficiency gain is 12%. It increases to about 7% at 130 kph (81 mph). Reduction in fuel consumption is achieved after three seconds or more."
Should not AEI require the correct SI symbol for kilometers per hour, km/h, and not the odious AP Stylebook random made-up abbreviation, kph? Both SAE metric practice (TSB003) and FMVSS 101 (speedometer marking) require the correct km/h, as does the SI Brochure or NIST SP 330. Therefore, it is not possible to drive 80 kph, only 80 km/h.
