fuel mileage
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New User
Joined: Oct 2011
Posts: 19
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fuel mileage
is the digital dash mileage indicator accurate? reason i ask is latley its been reading 14mpg..when i bought the truck 3 months ago it was 16-17 mpg and my driving conditions havent changed.
Senior User
Joined: Aug 2011
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does anyone know if the computer takes into account idling time. I hand calculated last tank and computer was off by almost 3 mpg, i did do some idling, prob close to an hour total between remote starts and other things... i am assuming thats why it was so off, and the truck only takes into accout while moving.
Super Moderator
Joined: Aug 2003
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From: Isanti, MN
To test this out, reset your lie-o-meter and drive a short distance. Then sit there and idle and watch. You'll watch it slowly go down!
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Lead Driver
Joined: Jan 2010
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Mine is 99.44% accurate from what I've calculated.
As Crazy said, the computer does take into account idle time.
At idle, I use around 0.004 GPM and 1,400 RPM high idle I use around 0.016 GPM.
As Crazy said, the computer does take into account idle time.
At idle, I use around 0.004 GPM and 1,400 RPM high idle I use around 0.016 GPM.
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Tuned
Joined: Dec 2010
Posts: 460
Likes: 51
From: Washington state
My computer mileage is usually within 3/10 of a mile of hand figured. Sometimes it will say more and sometimes it will say less than hand figured mileage. I always thought that it was the variances in fuel nozzels used that effected the milage I received from each fillup.
Elder User
Joined: Mar 2007
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From: at the truck pulls
When I first bought mine the first couple to three weeks I actually was babying it, letting it break in a little more and get a few hundred miles on it. I was getting better mileage then as well. Now I drive it like I always drive my vehicles.
I think that most people have that tendency, a brand new $50K-$60K truck usually gets a little easier life the first several weeks. IMHO anyway. Anybody think back to how they treated there's?
I think that most people have that tendency, a brand new $50K-$60K truck usually gets a little easier life the first several weeks. IMHO anyway. Anybody think back to how they treated there's?
Senior User
Joined: Aug 2011
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I get about 16.5 combined city and freeway driving, but if I reset the lie-o-meter I get about 18.5 on the freeway driving between 65-70. I live in the Phoenix metropolitan area and take about 2-3 trips per year to Salt Lake City (SLC) and notice that the first 150 miles or so I get about 17 mpg going 75 mp and notice a few regens before the Kingman area, but once I hit the Kingman area I notice the mpg starting to climb and by the time I get to Salt Lake City the lie-o-meter is at 22.5 - 22.8, the speeds from Kingman,AZ to Salt Lake City are anywhere from 75-80 mph. I wonder if the filter gets cleaned out during long drive at high speeds? When I get back to Phoenix my mpg is usually around 17.5 mpg combined driving for the next week and then starts dropping again and usually ends up around the 16.5. The trips to SLC are usually all empty driving. So I am wondering if the dirty filter has anything to do with lower mpg that everyone is seeing?
Lead Driver
Joined: Jan 2010
Posts: 6,600
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I averaged 19.0 (computer) trailer-less this weekend over 250 miles with a mixture of highway, two lane curvy/hilly back roads and several short trips (couldn't avoid it).
To be honest, I was shocked with the high number but I was also never over 67 MPH.
I drive mine harder now than I did when it was new once it's warmed up.
To be honest, I was shocked with the high number but I was also never over 67 MPH.
I drive mine harder now than I did when it was new once it's warmed up.
Senior User
Joined: Jun 2009
Posts: 136
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It seems strange how much your mileage has changed. The only times I've noticed drop into the 14's is if I'm towing. Otherwise it has been rather consistent over the 56,000 km (35,000 miles) I've driven since getting the truck in April. I guess I haven't been burning winter fuel so that may make a difference this winter...
Lead Driver
Joined: Nov 2005
Posts: 5,247
Likes: 4,267
From: Kaysville Utah
Your EGT temps will be higher at 65 mph fighting a headwind with trailer than at 80 mph with an empty truck.
I'll venture your gains are more affected by the change in elevation. You are climbing from Phoenix, but once in Utah on I-15, you stay pretty much between 4500 and 6500 foot elevation. Also at the higher elevation, Your injectors will lean out the fuel because the air is thinner. Just likethe old carburator days when we used to install smaller jets in the carbs for higher altitude driving.