Log in or Sign up
Forums
Forums
Quick Links
Search Forums
Recent Posts
Trucking Jobs
Truck GPS
Reviews
CDL Practice Tests
Schools
Freight Factoring
Trucking Insurance
Menu
Useful Searches
Recent Posts
More...
Find Trucking Jobs
Company Driver
Dry Van
Flatbed
Refrigerated
Specialized
Owner Operator
Regional Truck Driving
Dedicated Trucking
Tanker Driver
Solo Truck Driving
Local Truck Driving
Team Truck Driving
No Experience Truck Driving
Experienced Truck Driving
OTR Trucking
Intermodal Driver
Hazmat Driver
More Trucking Job Searches
⌄
Fewer Trucking Job Searches
⌃
TruckersReport.com Trucking Forum | #1 CDL Truck Driver Message Board
Forums
>
The Garage
>
Trucks [ Eighteen Wheelers ]
>
do you think cutting mph saves fuel?
>
Reply to Thread
Reply to Thread
Username:
Message:
<p>[QUOTE="DocHoof, post: 4647017, member: 151901"]I think your question is too vague. The variables involved work for one truck, but not another. My truck, for example is a 2000 Pete 379. When I bought it, it had LP22.5 tires, 4.7 gears and an 8 speed trans. That configuration, I ran around 65 Mph and I got 5.2 mpg for my first quarter IFTA in it. Then, I regeared the diff to 3.25, putt 11R22.5 tires on it. Now, I get my best fuel economy at 72 MPH and last quarter IFTA said 7.1 mpg for the quarter. </p><p>I watch everything, since I am an independent. Fuel is a biggie and I estimate per tank what my MPG was. Running out west where I can run 75-80 mph, I generally get 6.75-7.0 mpg. Back in the east where its 65-70, I get 7.0-7.5. 55 mph KILLS my mpg...6.0mpg! Mainly because 55 falls at 1550 rpm in 7th, or 1150 in 8th. And I just can't pull a load at 1150 rpm without risking damaging the engine from too low of RPM. So in my case, slowing down hurts my mpg. If I can run 72, I get right at 7.5 all day long. RPMs at 1400 makes me, my truck AND my wife happy.[/QUOTE]</p><p><br /></p>
[QUOTE="DocHoof, post: 4647017, member: 151901"]I think your question is too vague. The variables involved work for one truck, but not another. My truck, for example is a 2000 Pete 379. When I bought it, it had LP22.5 tires, 4.7 gears and an 8 speed trans. That configuration, I ran around 65 Mph and I got 5.2 mpg for my first quarter IFTA in it. Then, I regeared the diff to 3.25, putt 11R22.5 tires on it. Now, I get my best fuel economy at 72 MPH and last quarter IFTA said 7.1 mpg for the quarter. I watch everything, since I am an independent. Fuel is a biggie and I estimate per tank what my MPG was. Running out west where I can run 75-80 mph, I generally get 6.75-7.0 mpg. Back in the east where its 65-70, I get 7.0-7.5. 55 mph KILLS my mpg...6.0mpg! Mainly because 55 falls at 1550 rpm in 7th, or 1150 in 8th. And I just can't pull a load at 1150 rpm without risking damaging the engine from too low of RPM. So in my case, slowing down hurts my mpg. If I can run 72, I get right at 7.5 all day long. RPMs at 1400 makes me, my truck AND my wife happy.[/QUOTE]
Your username or email address:
Do you already have an account?
No, create an account now.
Yes, my password is:
Forgot your password?
TruckersReport.com Trucking Forum | #1 CDL Truck Driver Message Board
Forums
>
The Garage
>
Trucks [ Eighteen Wheelers ]
>
do you think cutting mph saves fuel?
>
Reply to Thread