What cruising RPM yields you the best mileage

[ponysarepretty]

2000 RPM at 65 here.

 

[propellerhead]

I would say 1800-2000. With stock gears in my auto, I could cruise at 65-70 and stay in the zone. Now with 410s, I have to be at 55-60.

 

[twogts4us]

This is rather silly - the answer is the lowest RPMs will yield you the best mileage when cruising.

 

[sgarlic]

45mph in 5th gear

 

[joshheat25]

2,500 at 65

 

[timeless2]

This is rather silly - the answer is the lowest RPMs will yield you the best mileage when cruising.

Discounting the fact that you are not lugging at a lower engine speed; very true.

 

[topless98gt]

This is rather silly - the answer is the lowest RPMs will yield you the best mileage when cruising.

1500rpm at 45mph: 1500rpm = 90000rph (rotations per hour) which yields 2000 rotations per mile.
1600rpm at 55mph: 1600rpm = 96000rph (rotations per hour) which yields 1745.45 rotations per mile, resulting in a better gas milage.

These are just numbers I pulled out of my ass

 

[billfisher]

about 1700-1800 rpm @ 60 mph on interstate. cruise on. 28mpg. 385 miles per tank.

 

[billfisher]

rotations per mile only changes with gear. lower rpm's with the same gear = same rotations per mile. just an observation.

 

[ponysarepretty]

I think I've been lugging by engine lately, giving it too little gas etc. This week, I drive it fairly hard and see where the mileage lands... had to go wot like 5 times today after that seafoam stuff

 

[billfisher]

if you turn something slower there is less drag. aero = the square of velocity. oil windage even more. all gear to gear friction is less with lower speed to a point. a tune with 14.5:1 fuel,high part throttle/low load spark advance. and drive slow... or get a moped. 180 yamaha = 65 mpg@max 60 mph laying on gas tank.

 

[super302]

5th gear at 25mph=1200rpms

 

['13_ImpactBlue_GT]

about 1700-1800 rpm @ 60 mph on interstate. cruise on. 28mpg. 385 miles per tank.

DAMN!!! 60 on the Interstate thats a sure fire way to get thy azz runeth over.

 

[03ghoststang]

good gas mileage that dosen't apply to me LOL

 

[merc123]

90 MPH in 3rd.

 

[RedDaemon]

i remember a while back someone made a REALLY nich Excel Chart on the different rpms and gas mileage for different gear ratios....maybe a search master can dig it up

maybe it was just rpms vs mph w/ diff gears...idr

 

[Venom_Nitrous]

My scan guage gives me MPG readout and the best is 35 mph in 5th gear which gives about 40 mpg cruizing in a straight line. I have adjusted my driving style and found that shifting from 1st to 3rd at about 1700 and 3rd to 5th at 1700 gave the best results. I went from 14 mpg in town to over 23. The best recorded mileage is at 35 in 5th. Anything above that starts to detract. I also found that 1000 rpm gives the best mileage. It is that simple. Lower RPM = better mileage even if the engine sounds like it lugs at 1000 rpm.

 

[streetstang03]

wheres the fun in that? drive like a bat out of hell while you still can....

 

[GDawg]

Park it and ride the bus... that's the best mileage for your buck.

 

[merc123]

i remember a while back someone made a REALLY nich Excel Chart on the different rpms and gas mileage for different gear ratios....maybe a search master can dig it up

maybe it was just rpms vs mph w/ diff gears...idr

It was RPM vs. MPH with different gears. There's no way to calculate gas mileage (I would think)