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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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