Does driving more slowly actually save more gas?

They say that you save gas just by reducing your speed by 5mph. If you are at a stop sign and you jump start, you use more gas.

nope

Driving slower will save on gas by lowering wind resistance. If you want to try a simple test, roll down your window and stick your hand out at a few different speeds. Does it take more of an effort to hold your arm straight at a slower speed or a faster speed?

Say you are going 100 miles. You can get there in an hour at 100 miles an hour getting 10 miles to the gallon or in an hour and 40 minutes going 60 while getting 20 miles to the gallon. Going 100 will take 10 gallons, going 60 will take 5. Just because the engine runs longer does not mean it will burn more gas.

yes going slower will save fuel! in mich.the speed limit for a semi truck is 60 mph,if i drive 55 i get less wind force against the front saving about 1 to2 mpg. if you add it up at the end of the year i save a few thousand dollars….

It is a no brainier that driving slower is more fuel efficient in a sense. All these studies by engineers and other geeks are not 100% ccorrect however. They treat the time factor like its a luxury when it is not, and has to be accounted for. As long as your burning fuel at a constant speed, driving 75 vs 55 will be pretty close to equal in dollars spent. If you drove 55 mph you would be driving nearly 30 % longer therefore you must add how much fuel 30% of your drive would be at the end. You simply can’t neglect the time factor, which makes all these studies, charts, and graphs wrong. Will someone please do a study that uses the time factor.

For my particular vehicle, going at 75 mph = 25 mpg, at 60-65 mph = 28 mpg, 55 mph = 32mpg. Lets say I am going on a 500 mile road trip. at 75 mph it would take me about 6 hr 40 min, and use 20 gallons of gas. between 60-65 mph it would take 7 hr 40 min- 8hr 20 min and use 18 gallons of gas. at 55 mph it would take 9 hrs and use 15.5 gallons of gas. My car holds 16.9 gallons of gas according to the manufacturer. Theoretically, if I started with a full tank of gas I would not need to stop. So, if gas costs $3.50/gal going 55mph would save me $15.75 on the trip, but it would take me 2 hrs and 10 minutes longer to reach my destination taking ten minutes off for the 75mph car to stop and fill up. So, if $7.30 an hour is worth it to me I slow down to 55 mph. The biggest benefit I have encountered by driving at 55mph is that I seldom have to accelerate or decelerate and change lanes, thus the drive becomes much less stressful for me. If we say that 15,000 miles per year is the average, then at 55mph I would save $460. Furthermore if only driving 50 miles per trip the time saved is only a few minutes when traffic is taken into consideration. I can sustain a constant 55 mph speed limit but not a constant 75mph speed limit during most of my commute. I guess that it all boils down to driving preference, but I will not be the person speeding down the highway stressed out because of constantly having to adjust for other drivers inconsistent driving and cell phone talking and texting. The reason that there is not a standard 55 mph speed limit is because many states and the federal government levee a tax on the per gallon price of gas and it brings in more revenue than handing out speeding tickets.