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  #1  
Old 09-25-2013, 02:57 AM
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6.4 mpg

My truck is an 08 f350 lariat crew cab
Engine and tires are stock size. Gears are 3.73. 91000 miles.
Here is a pic of my dash computer after I reset it and driving 6-8 miles down secondary road, no lights, no traffic and cruising around 45- 50 mph. I took this at first traffic light. If pic doesn't show up it shows 21.5 average. I have driven the truck back and forth to work every day about 20-25 miles round trip all week and back and forth to kids games all weekend. Still had a quarter tank left. 30 gallon tank. My old v-10 would be empty in 3 days just going back and forth to work. My old truck averaged 11mpg. Driving home from dealership I reset in on highway. About 30- 40 mile drive all high way and cruise set at 65. It would go up and down as road incline changed but finished trip saying 22 mpg. Could this be accurate?
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Old 09-25-2013, 02:59 AM
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Probably, until it regens...
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Old 09-25-2013, 04:25 AM
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I had at least one regen on that same tank. "Cleaning exhaust filter".
Puff of white smoke. Strong smell of diesel exhaust. Slightest loss of power. Not really a big deal.
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Old 09-25-2013, 04:26 AM
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The only way the dash is going to be fairly accurate is if you reset it when you fill up, and then do not touch it until you fill up again. When you fill up again it should be fairly close (if your truck is in stock form). Resetting it while going down the road doesn't do nothing but leave you disappointed whenever you hand calculate that tank
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Old 09-25-2013, 06:58 AM
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That is showing a best case scenario. You're probably never going to get better mileage than tooling down a back road at 50, or jumping on the interstate and driving modestly. REAL LIFE day to day numbers won't be anywhere close to that.

If you put it in neutral, roll it down a hill with a tailwind and reset the trip meter as you're doing this you'll get even better mileage, but doesn't mean it's accurate.
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Old 09-25-2013, 08:39 AM
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It is best to hand calculate. Mine reads around 20.5-21.5 on my regular routine, which calculates out to be about 14.5-15.5 mpg. If I reset the computer before a long highway trip (say 3-4 hours drive), it will read somewhere in the 24 range and hand-calculate out to around 17 mpg.

I use the aCar app on my android phone. It is easy to keep records of everything, and calculates stuff including mpg and costs/mile etc.
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Old 10-09-2013, 07:39 PM
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Quote:
Originally Posted by Padec21 View Post
My truck is an 08 f350 lariat crew cab
Engine and tires are stock size. Gears are 3.73. 91000 miles.
Here is a pic of my dash computer after I reset it and driving 6-8 miles down secondary road, no lights, no traffic and cruising around 45- 50 mph. I took this at first traffic light. If pic doesn't show up it shows 21.5 average. I have driven the truck back and forth to work every day about 20-25 miles round trip all week and back and forth to kids games all weekend. Still had a quarter tank left. 30 gallon tank. My old v-10 would be empty in 3 days just going back and forth to work. My old truck averaged 11mpg. Driving home from dealership I reset in on highway. About 30- 40 mile drive all high way and cruise set at 65. It would go up and down as road incline changed but finished trip saying 22 mpg. Could this be accurate?
How hard is it to divide miles by gallons to answer your question about accuracy?

My F-250's Fool Computer was pretty consistent at 20% high. If it said 12 MPG, it was actually 10 with a calculator. If it said 23 MPG then it was 18 with calculator.

Once it said 16 and was actually 15.8. I was shocked.

Reset every time the tank was filled.
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Old 10-11-2013, 06:40 AM
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i have a question what RPM is everyone running at on the highway... i think my truck has 4:30 gears in it and im turning around 2250 rpm at 70 mph it says im getting like 16mpg per tank and hand calulated i get like 15.3 so that anit to bad for 540 miles per tank. But if im doing under 60mph i can see upwards of 22mpg...
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Old 10-12-2013, 06:32 AM
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With 3.55 and 35x12.50-20 I'm at 80mph at 2000rpm.
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Old 10-12-2013, 07:50 AM
IHR IHR is offline
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2010 F-450 hauling a 43' 5th wheel. From Washington state to Vegas and back, average of 6.7 MPG. I'm pretty well done with this truck. It would stay in regen for hours at a time. In my opinion this engine, due to all the emissions controls crap really sucks.
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