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 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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