Best speed for MPG
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Best speed for MPG
I was reading something pretty extensively tested and thorough a long time ago on the internet. I think it might have been at howstuffworks.com That's one of my favorite sites to visit about automotive stuff, because I don't know much yet. Anyways... they had done extensive testing to find out what the best possible speed is to get the best mileage for your gas... and the winner is...
65 MPH.
The absolute best speed you can possibly go to get the most gas mileage is estimated around 65 MPH. It's not a government ploy to get you to stop speeding, it's simple physics. The amount of gas it takes to speed is factored into the distance you'd be going at that speed and the peak of distance per speed is reached at 65 MPH.
Any faster than 65 MPH and you're using too much gas for negligble distance gains, and any slower than 65 MPH and you're not gaining enough distance for the amount of gas that it takes to get there.
This is just a little FYI - If you're on a long trip somewhere and you're as strapped for cash as I am (I have 3 dollars) DONT FORGET - 65 MPH is your friend. I know that's practically blasphemous in a Cobalt (I never go 65 - lol) but it really does work.
You can test it by looking at your estimated MPG while staying at 65 for a long time.
-Aleckor
65 MPH.
The absolute best speed you can possibly go to get the most gas mileage is estimated around 65 MPH. It's not a government ploy to get you to stop speeding, it's simple physics. The amount of gas it takes to speed is factored into the distance you'd be going at that speed and the peak of distance per speed is reached at 65 MPH.
Any faster than 65 MPH and you're using too much gas for negligble distance gains, and any slower than 65 MPH and you're not gaining enough distance for the amount of gas that it takes to get there.
This is just a little FYI - If you're on a long trip somewhere and you're as strapped for cash as I am (I have 3 dollars) DONT FORGET - 65 MPH is your friend. I know that's practically blasphemous in a Cobalt (I never go 65 - lol) but it really does work.
You can test it by looking at your estimated MPG while staying at 65 for a long time.
-Aleckor
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Arcmarksthespot (05-18-2024)
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It's usually around 65 on most cars. It depends on a number of factors tho.
If you look close enough, you'll find that even the temperature of the air affects gas consumption.
If you look close enough, you'll find that even the temperature of the air affects gas consumption.
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Right, of course it depends on your specific car and a bunch of other factors... but what I meant was that 65 is the estimated "sweet spot" on every single car. It's just estimated. Of course it'll be different for each individual car.
But next time you're on a long trip, 65 is a good place to start testing your MPG. It'll save you thousands of dollars in the long run.
-Aleckor
But next time you're on a long trip, 65 is a good place to start testing your MPG. It'll save you thousands of dollars in the long run.
-Aleckor
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I get my best mileage (about 35 mpg) around 60-62 mph in my Cobalt.
I get my best mileage (about 12.5 mpg) around 40 mph in my lifted Jeep Wrangler... Go figure
I get my best mileage (about 12.5 mpg) around 40 mph in my lifted Jeep Wrangler... Go figure
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Hmm, I've found it's the rpms, about 2750 in 5th gear on the hiway seem to be where I'll peak at. Any faster and the estamated mpg begins to drop.
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you cant really set a certain number like 65MPH, becasue people will disagree with it no matter what. For me, i have found 105KM/H is the sweet spot. ( i dont know what that is in MPH)
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the biggest factor is wind resistance. right around 55 mph is when the wind resistance starts to play a huge role in your gas mileage. after that it comes down to gearing.
#17
That's 65mph. Also the sweet spot for me. Was getting 45 mpg at that speed following a semi.
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i noticed that in the morning on the way to work.. if i set the cruise at 65 MPH.. i get good MPG.. but if i set it at lets say 75-80 mph i get a lower MPG.
later
later
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The lower you are in the rpms on the highway,the better gas mileage you will get.You cant go by speed.If you doing 60 mph in 4th gear and 60 mph in 5th gear,your gonna get better mileage in 5th because your running at a lower rpm.
#24
Actually the best speed is much lower. Normally around 30 mph. Not that this info is useful; who's gonna drive that slow? In general slower means less air resistance but you need to be in high gear.
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I know this from a stint in Nebraska during a roadtrip in my Wrangler before I got new gear ratios... There were 50+ mph sustained headwinds. I spent a lot of time in 5th gear trying to keep speed and got an aweful 8 mpg. I'd shift into 4th (and use less throttle to keep speed) and I was getting upwards of 10-11 mpg. Still horribly low, but better than 8 mpg...
Yep, it's why the Corvette Z06 got such good gas mileage in the city. They did the test at those low speeds in 6th gear! If you're chugging along nearly stalling the engine at 30 mph you're gonna get some pretty nice mpg numbers
Last edited by Illini_06SS; 07-19-2007 at 03:44 PM. Reason: Automerged Doublepost