18 mpgs with 33x12.50 Muds Terrains - Ford Powerstroke Diesel Forum
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Old 02-04-2009, 12:39 PM
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18 mpgs with 33x12.50 Muds Terrains

I have an f350 CC LB 4x4 with a 2" leveling kit and 33x12.50x18 toyo mt's. I dont think I'm asking to much to want to get 18mpgs on a highway trip right now I average 15-16 all the time highway or all around driving. What I want to no is what SCT tunes are you guys running for the best milage.
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Old 02-04-2009, 01:02 PM
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How fast are you running? Speed makes a huge difference with mileage in these trucks. I get the best mileage (16.5) with the Mild Street Economy tune, but most will say Hybrid Race is the best if you keep your foot out of it.
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Old 02-04-2009, 07:39 PM
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This cold weather is killing my milage. I am sure yours suffers some as well.
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Old 02-04-2009, 09:54 PM
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Ya I was hoping to see if I could get 18 this summer. My mpgs are still 16 summer and winter.
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Old 02-05-2009, 01:33 AM
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Diesels run more efficently when Warm
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Old 02-05-2009, 12:16 PM
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Is there anybody when its warm outside hitting 18mpgs. with mud tires.
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Old 02-05-2009, 12:23 PM
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Same set up as you - but 33x12.50R16 - 55 - 60mph - 18-22 hand calc'd depending on trip.

F-250 SC Long Bed, 4wd, 5R110, 175,000 miles. No tuner, no custom exhaust, stock airbox. zoodad.

Higher the speed - less the mileage.
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Old 02-05-2009, 12:29 PM
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i see my best at 2k rpms with my custom dyno race tune. on the highway it's up to 22 or so. but those numbers are not very often since i can't keep my foot out of it.
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Old 02-05-2009, 12:36 PM
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Winter my mileage is lower - guessing the crappy fuel. I travel 79 miles to work - mostly Rte 4, 495, and 267 in VA - with traffic and RPM's around 1600 - I'm getting around 18. Monday was sweet - no traffic - straight shot - great mileage!
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Old 02-05-2009, 01:11 PM
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With my xtreme tune im averaging according to my truck mpg meter 15 maybe 16 on the highway on 37's . my average speed is about 60 65. So i may be getting more miles to the gallon or maybe less and i also know that my speedometer is off by 6 miles. so i think that may be a positive factor for me.
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