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Old 05-06-2010
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Optimal cruising rpm?

Im starting to take the highway more often to and from school and was wondering what the optimal cruising rpm would be to get the best mpg outta my truck?
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Old 05-06-2010
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ive got better mileage at about 2000-2400 rpm but thats just me
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Old 05-06-2010
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Every ford truck i've driven has gotten the best MPG at 55mph. Which may be a problem when the speed limit is 60.
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Old 05-06-2010
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i try to keep it under 2500. me with 4.10's and 33's im bang on 2000 at 65
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Old 05-07-2010
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i try to keep it under 2500. me with 4.10's and 33's im bang on 2000 at 65
How with 4.10's and bigger tires are you at such a low rpm at 65? I have 3.73 and stock tires and im doing about 2250-2300 at 65.
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Old 05-07-2010
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dunno but its not bad
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Old 05-07-2010
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dunno but its not bad
Hmm...maybe you have a 6th gear we don't know about
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Old 05-07-2010
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i'm going to drive with my gps to work tomorrow, see what i'm running at 65mph, 2000 seems low to me... i also have 4.10's and 33's

i know i pass everyone on the hiway when i'm doing 100 on the spedo (about 63) and traffic normally moves around 100-120km/h
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Old 05-07-2010
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i'm going to drive with my gps to work tomorrow, see what i'm running at 65mph, 2000 seems low to me... i also have 4.10's and 33's
Glad i'm not the only one who thinks 2000 is too low.
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Old 05-07-2010
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I cant say what my rpm's are at, but a good cruising speed is about 80mph on the interstate.
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Old 05-07-2010
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i used to do 135-140 km/h every day, but was sucking down gas... i slowed to a 120 average and it went way up... i've been meaning to get one of those scangauges to see what my live MPG is...
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Old 05-07-2010
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right around 1900 at 60, which i guess isnt normal, but w/e
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Old 05-07-2010
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I get best mileage at 1500 rpm which is only 45mph. On the highway I do 70 which is around 2500 rpm.
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Old 05-07-2010
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On the highway I do 70 which is around 2500 rpm.
Spot on where I'm at,at 70.
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Old 05-07-2010
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65mph, stock tires, 410s gets me WAY better milage and isnt THAT slow...even in cali
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Old 05-07-2010
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not sure how much of a difference it makes, but I have stock gearing with over sized tires.
as far as mpg, I can not say for certain and I dont have a tach so I have no way of reading rpm.
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Old 05-08-2010
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Originally Posted by cdfink08 View Post
Spot on where I'm at,at 70.
I too am right there. 3.0 with 235/75/15's is getting me around 22 mpg - mostly highway driving at 70mph/2500rpm
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Old 05-08-2010
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well from taking the highway to and from school instead of city i have gotten about 30 miles more outta my tank. I fluctuate in speed though. I try to keep it around 2500 @ 75 mpg with 4.10's
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Old 05-08-2010
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Quote:
Originally Posted by --weezl-- View Post
i'm going to drive with my gps to work tomorrow, see what i'm running at 65mph, 2000 seems low to me... i also have 4.10's and 33's

i know i pass everyone on the hiway when i'm doing 100 on the spedo (about 63) and traffic normally moves around 100-120km/h
you were right good sir...pics to prove... i got mixed up, chit happens.

4.0, 4.10's, and 33s....result

Name:  speedo.jpg
Views: 122
Size:  58.4 KB

Name:  tach.jpg
Views: 120
Size:  69.3 KB
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Old 05-09-2010
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ummm, you don't realize, larger tires will throw your speedo out, so if you changed your tires, without changing the speedo gear, you are doing faster than your speedo says... i was driving to work tonight, didn't have my GPS, but i was around 65 mph, and just over 2000 rpm (this speed is based on the speedo of a car directly infront of mine [talking to my dad on the phone])
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Old 05-09-2010
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i do realize it... i driven lifted trucks my whole life...honestly this is the smallest truck i have ever owned....well hight wise...

my speedo isnt that far off really.if i stick it at 55 i never pass anyone. stick it at 60 and i kinda do... ill try the gps today ad see about pics
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Old 05-09-2010
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what's more accurate, a properly calibrated speedo or gps?
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Old 05-09-2010
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I need to learn how to save gas. I just figured out my milegae on my last whole tank and it was 13.7 mpg
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