Basically, Wind resistance increases as you try to go faster and faster. If you're going 65 and you want to go 80, you'll be using more gas because the truck is trying to push more and more air out of the way all at once.
60 seems to be a nice speed, **at least for me and my other family's cars and trucks** and people who go 75-80 really burn up that fuel, except for when it's all downhill.
My ford ranger 4 cylinder with 4.10 gears and a 5 speed manual gets 26 mpg hiway at 65. Anything above 65 and my gas mileage goes way down because i'd be running upwards of 2800 rpm's or so.
**IFFFFF... I had the same vehicle with 3.73 gears.... I CAN expect to run 70 mph and still get 25-26 mpg. HOWEVER... my torque at the wheels will be LOST with the higher gearset... therefore making my engine work HARDER AT LOWER SPEEDS... using more fuel as a result.
***OVERALL- I do NOT believe that there is ANY set formula for each vehicle to get good gas mileage. Road conditions, gross vehicle weight, number of engine cylinders, car or truck, auto or manual tranny, high gears or low gears, and even the person driving ALL change that variable gas mileage.
There is no real argument here other than that anything over 75 mph and drag-race-acceleration is just downright ridiculous for saving gas.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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