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Originally Posted by Ecky
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Watched the video. Thanks! Jason needs to be commended for ferreting out the details.
SAE test protocols would have included continuous meteorological measurements and normalizing data to standard atmosphere. Temperature variability as related to rolling resistance would have to be accounted for. Topographic effects, A-B, back-to-back testing . Curves on the 'test track' would not be allowed. Climate control would not be allowed.(I have a note which suggests that a heat-pump-sourced AC unit absorbs 1.6 kW).The 18-inch wheels are an unknown quantity. Only a wind tunnel would tell, unless Tesla has made a claim as to their added efficiency.
What Jason and CAR and DRIVER has done, does reflect the 'real world', in terms of what the average motorist would probably be willing to put up with ,when compiling road trip data.
One telling road test, I believe,by MOTOR TREND, involved a Model S, with a BMW 5-series shadowing behind, at exactly the same conditions. On a Btu-basis, when the cars were 're-filled', the Tesla ended up with a brake-specific-fuel-consumption-equivalency equal to around 1/3rd that of the Bimmer., on the order of BSFC 0.138-pounds/bhp-hour. This is where the battery/inverter/motor/and planetary gearset really shine. I think Jason Fenske has used 'insane efficiency' to describe Tesla's performance. Quite fitting!
