Dont' use mpg & perf/watt, please use gpm & watt/perf!
Friday Jun 20, 2008
miles/gallon is as misleading to consumers! Remember when I said perf/watt is misleading. How do we all avoid these 'math illusions'? Duke University researchers tell us this is simple, just "flip 'em"
Posting a vehicle’s fuel efficiency in “gallons per mile” (GPM) rather than “miles per gallon” (MPG) would help consumers make better decisions about car purchases and environmental impact, researchers from Duke University’s Fuqua School of Business report in the June 20 issue of Science magazine.Video of Larrick & Soll discussing their research: click here
Article on Larrick & Soll’s research, which was funded by Duke University.
Check out the above video, you can see that people try to judge by linear improvement in miles/gallon, but this is very misleading. The recommend that we switch to gallons/mile!
Remember back in March 2007, where I said the metric is watt/performance and not perf/watt. http://blogs.sun.com/bmseer/entry/power_efficiency_metrics_clearing_up. Time for SPEC to reconsider their metrics, and only allow default settings to be measured in benchmarks (if power-management is not on by factory default it should NOT be measured in a test - that way customers are best served.
Improving inefficient cars saves a lot of gas, the same valid reasoning shows improving %utilisation IS the big win especially when coupled with efficient servers.
Nothing like a little vindication to start the weekend, OK it's getting late, cya next week 
for a table on savings at differnet miles/gallon see: http://www.fuqua.duke.edu/news/mpg/table.pdf
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Tags: performance specpower specpower_ssj watt/performance
Even better would be liter/kilometer
I should cocoa! ...but you know these 'mericans.