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in their tests of efficient vs inefficient, the 'efficient' driver got 575 miles on a tank, while the inefficient driver got 250.at highway speeds up to a third is used to overcome wind resistance so even small changes to your vehicle's aerodynamics will have a big impact on fuel economy."
"When you're driving across town, in stop-and-go traffic," says Frank Hampshire, director of market research with the Automotive Aftermarket Suppliers Association, or AASA, "it's more fuel efficient to drive with the air conditioning off, windows down."
Consumer Reports' auto-test department reports that the air conditioner reduces your car's fuel efficiency by up to 10 percent. So to achieve maximum fuel efficiency, motorists should avoid using the air conditioner at speeds below 40 mph and travel with their windows down, explains Gabe Shenhar, senior auto test engineer at Consumer Report's auto-test department.
"But as your speed increases to 45 mph, or highway speeds," says Jason Toews, co-founder of GasBuddy.com, "wind drag becomes an issue. Driving with the windows down increases the drag on your vehicle, resulting in decreased fuel economy by up to 10 percent. Drive at speeds over 55 mph with windows down and you'll decrease fuel economy by up to 20 percent or greater."
That's what I figured. Any guesstimates as to what % efficiency you're losing with, say, driver+passenger window down? And sunroof?
Do you never drive with your windows down, or at least cracked open? On a 71 day, I'll always have the windows down over ACHas it been discussed that all of the RC's we have seen driven around have a window or two open? Do they not have the new air conditioner working it is that a California thing? Current Temp in Fremont is 71 degrees.
It's typically more energy efficient to drive with your windows closed, and the A/C on. Wind resistance is a serious drag.Do you never drive with your windows down, or at least cracked open? On a 71 day, I'll always have the windows down over AC
CHARTS: It's More Efficient To Drive With Your Windows Open Than Air Conditioner OnIt's typically more energy efficient to drive with your windows closed, and the A/C on. Wind resistance is a serious drag.
Does this apply to EV cars as well, with their extreme focus on aerodynamics?
Aero has more effect at high speeds, around town it will have almost no effect.Does this apply to EV cars as well, with their extreme focus on aerodynamics?
I'd like to see a study with EVs. In that study, the lower the fuel efficiency (the SUV), the more pronounced the losses of using A/C are. EVs are totally different beasts, though. Both they're more sensitive to wind drag (you don't notice it as much with ICE because they're so inefficient in the first place), and (at least in my Model X), the A/C is a pure electric highly efficient scroll compressor.
I'd like to see a study with EVs. In that study, the lower the fuel efficiency (the SUV), the more pronounced the losses of using A/C are. EVs are totally different beasts, though. Both they're more sensitive to wind drag (you don't notice it as much with ICE because they're so inefficient in the first place), and (at least in my Model X), the A/C is a pure electric highly efficient scroll compressor.
The referenced study was for an ICE, which commonly has about one third of the efficiency of an induction run electric motor. It was also published in 2004 with the test vehicles being a "full sized" sedan (4.6L V8 engine) and a "full sized" SUV (8.1L V8), with both being GM products, neither of which (especially the SUV) being very likely to have aerodynamic characteristics that even approach a Tesla.[URL='http://www.businessinsider.com/car-fuel-efficiency-ac-air-conditioner-on-windows-down-open-2013-9' said:CHARTS: It's More Efficient To Drive With Your Windows Open Than Air Conditioner On[/URL]
I believe you're referring to buffeting. This happens with every aerodynamic car and sometimes non-aerodynamic cars. It's caused by the laminar airflow being disturbed, and happens when you open the windows more than some amount (likely varies somewhat by individual car).on a side note, does anybody else experiencing super load cabin noise / resonance whenever you have one side of the windows down on the model s? not exactly sure how to describe it... and it typically starts once you go above 30-40 mph.. we have 2017 refreshed MS.