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RPM for best MPG

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Old 05-28-2014, 02:05 PM
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#1Pussologist
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Default RPM for best MPG
So I assume 3000 RPM is the proper rpm to cruise in and get the right MPG.
So lets say I am cruising at 70 mph at 3200-3300 rpm. Is this bad for the engine?
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Old 05-28-2014, 03:04 PM
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Toneloc
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no its not bad... I run close to 3200rpm going 85mph and got 25.4 mpg on a 400mile trip...
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Old 05-28-2014, 03:05 PM
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Syner
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Seriously?

Did you fall down the stairs as a child?
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Old 05-28-2014, 03:25 PM
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1973camarolt
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Your user name is very interesting. Look at a BSFC map for our cars and it'll give you a general idea of what RPM and load you should aim for to get the best gas mileage. I can link you to the relevant equations if you really want them. It'd be much easier to figure it out empirically in my opinion.
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Old 05-28-2014, 03:38 PM
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travlee
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Originally Posted by Syner
Seriously?

Did you fall down the stairs as a child?
probably thrown. i am not sure what i get on the highway, but accoriding to the pod in the dash i get 17.4, that is with full bolt ons and a tune
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Old 05-28-2014, 03:44 PM
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bith8791
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I cruise at 70mph on the highway at/or around 2500rpm and get around 26-27mpg.
Last edited by bith8791; 05-30-2014 at 02:20 PM.
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Old 05-28-2014, 03:48 PM
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travlee
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very few of my miles are hwy
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Old 05-28-2014, 05:52 PM
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G35HR
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Originally Posted by travlee9374
probably thrown. i am not sure what i get on the highway, but accoriding to the pod in the dash i get 17.4, that is with full bolt ons and a tune
off topic, but curious how much power you are making?
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Old 05-28-2014, 06:01 PM
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mr. sparco
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I wonder how many mpg threads we've had since 2002.
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Old 05-28-2014, 07:18 PM
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92K1500
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If I run 65mph in 6th gear even with rolling hills I can average 31-32.5mpg windows up a/c on.
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Old 05-28-2014, 07:52 PM
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johnx818
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Originally Posted by 1973camarolt
Your user name is very interesting. Look at a BSFC map for our cars and it'll give you a general idea of what RPM and load you should aim for to get the best gas mileage. I can link you to the relevant equations if you really want them. It'd be much easier to figure it out empirically in my opinion.
I'm interested in those links you speak of, camaro.
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Old 05-28-2014, 11:33 PM
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terrasmak
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Target would be in top gear around 65 mph , after that you lose MPG. I set cruise just shy of 80 and I'm happy with my consumption.
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Old 05-29-2014, 05:22 PM
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1973camarolt
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Johnx818, you have a PM.
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Old 06-01-2014, 08:01 AM
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Friday, I made an approximate 150 mile road trip. I set the cruise on 70 mph, in 6th gear, top up and the AC on. That included some urban traffic as well.
At the end of the trip I was hitting almost 29 mpg according to the on board computer.
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Old 06-01-2014, 08:20 AM
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The_Assassin
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Am at around 17 mpg with full bolt ons and 4.08 final drive no tune.
Last edited by The_Assassin; 06-01-2014 at 08:34 AM.
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Old 06-01-2014, 08:43 AM
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Originally Posted by Blu Hvn
Friday, I made an approximate 150 mile road trip. I set the cruise on 70 mph, in 6th gear, top up and the AC on. That included some urban traffic as well.
At the end of the trip I was hitting almost 29 mpg according to the on board computer.

The dash lies. A couple road trips ago I was fighting to keep it above 30.0 on the dash. When I filled up I did the math and I actually got 32.5mpg.

The dash just gives you a close guess.
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Old 06-01-2014, 08:44 AM
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92K1500
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Originally Posted by The_Assassin
Am at around 17 mpg with full bolt ons and 4.08 final drive no tune.
Is that city or highway? I would cry if I got 17. My built cammed V8 4x4 pickup gets 15mpg at 80mph...
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Old 06-01-2014, 09:03 AM
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The_Assassin
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Originally Posted by 92K1500
Is that city or highway? I would cry if I got 17. My built cammed V8 4x4 pickup gets 15mpg at 80mph...

Thats city mpg. High way I sometimes get in the 19 mpg range if I keep the rpms down.
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Old 06-01-2014, 10:46 AM
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Well at least I know I don't want 4.08's anymore. I wouldn't have a bank account left.
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Old 06-01-2014, 11:28 AM
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The_Assassin
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Originally Posted by 92K1500
Well at least I know I don't want 4.08's anymore. I wouldn't have a bank account left.
Yea I cry every time I go to the gas station. Lol its worth it man.
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