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- Slow down on the highway, cars are designed to run efficiently around 65 to 70mph so anything over that is just wasteful - correct - best to get to speed then be more ginger with the pedal, take advantage of hills with a light pedal
-Every 100lbs extra in your car takes 1% of your mileage, so throw the kids out the window - funny
-Accelerate slow, that burns a ton of gas - yep - best to get to speed then be more ginger with the pedal, take advantage of hills with a light pedal
-If you're at a dead stop for a long time (Gridlock, Parking lot, waiting for someone) shut the engine off, start up does take a lot of gas but it is equivalent to 38 seconds or something like that of idle time - false, shutting off your engine burns no gas, restarting burns just the gas to run at increased idle, in fact many hybrid vehicles engage / disengage the gas engines in stop/start conditions.
-No AC, roll down the windows - false, todays cars with very efficient AC compressors and significant aero dynamic benefits, on the highway, will better make use of closed windows and the improved air flow over the car than the intermittant cycling of the AC compressor... That was definitely tru 20+ years ago but not today...
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