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Old 11-14-2008, 07:01 AM
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MPG Update

Would like to post what I'm getting on MPG's with my truck now... Almost 17k miles. 15-40 Dino oil. Driving 67 miles round tip per day for work. that's going THROUGH the whole city of Tampa each trip and some 55/60mph roads with some idiots that have to stop to turn. On this tank I'm averaging 17.1 on the meter. I've checked my meter, it's accurate. Pretty happy with the numbers with so much city driving. I'd Like to improve it though...
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Old 11-14-2008, 07:14 AM
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17 mpg average is pretty good for city driving mixed in. I just took a highway trip and averaged 19.7 at 65 mph. There was maybe a 5 mph tail wind. This is about the best I have seen.
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Old 11-14-2008, 07:41 AM
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I'm running the latest PCM Re-flash, Stock 20's and stock AT/S tires, 70psi Front/65psi Rear (cold) in the tires. That 17.1 is with no A/C use and no fuel additive. A/c seems to kill my MPG's. This weekend I'm going to take some wear patterns of the front tires at 75psi, see what they look like. I won't go higher than 65 in the rear... wear pattern is maxed out and perfect. I'm also looking at a doing something with the EGR valve/up pipe and SCTing.
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Old 11-14-2008, 08:53 AM
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When my 06 F250 was stock I would get 17-18 MPG on the freeway via the speedo gauge... now 37" tires, 8" lift later, I get around 11-13 MPG. I have the SCT X3 with Eric's tunes, and I was wondering if the tuner changes my speedometer and my mpg gauge on my truck? Because I roughly check my distance traveled in comparison to my trip miles on my gauge, and it seems to be off.. I would like to manually check my MPG but if my distance traveled is off due to my tire size, can I even determine this correctly? I also run full synthetic, with RBP fuel additive, with obviously everything else on my Sig. Would my larger gears (4.56) contribute to this?
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Old 11-14-2008, 04:16 PM
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wish i got 17 mpg.
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Old 11-14-2008, 04:25 PM
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i can do 17 all freeway driving with a really light foot
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Old 11-14-2008, 06:43 PM
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The tuner cannot correct your speedo or odometer, so unless you had Ford reprogram your ABS module or you have an inline module like the TruSpeed your mileage calculations are not correct. 37" tires are roughly 15% larger than stock, so you need to multiply your odometer readings by 1.15 to get the correct mileage for MPG calculations. OR you can multiply the end result by 1.15. So if you saw 11-13mpg with incorrect odometer readings, you are actually getting about 12.7-15mpg.

Quote:
Originally Posted by metstroke06 View Post
When my 06 F250 was stock I would get 17-18 MPG on the freeway via the speedo gauge... now 37" tires, 8" lift later, I get around 11-13 MPG. I have the SCT X3 with Eric's tunes, and I was wondering if the tuner changes my speedometer and my mpg gauge on my truck? Because I roughly check my distance traveled in comparison to my trip miles on my gauge, and it seems to be off.. I would like to manually check my MPG but if my distance traveled is off due to my tire size, can I even determine this correctly? I also run full synthetic, with RBP fuel additive, with obviously everything else on my Sig. Would my larger gears (4.56) contribute to this?
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Old 11-17-2008, 06:53 PM
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i would not trust the above head display for milege... but as far as i know the only thing that will correct that for tire size is an inline device.. the top 3 are truspeed, Merlin Controls speed wizard, and jet accuspeed

good luck

kenny
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Old 12-11-2008, 08:39 AM
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mileage

check distance rolled compared to the odometer by the expressway
mileage signs, or check it with gps.
might be an answer
Dan
2004 f250
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Old 12-11-2008, 11:05 AM
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I have 2 GPS units. Mileage is accurate.
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