7.3L Mpg - Page 2 - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #16 of 21 (permalink) Old 07-10-2016, 11:56 AM
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I recently changed engine oil to synthetic and picked up 1.5 mpg city and 3 hwy. This data is by computer but something changed as a result of oil. Will hand calc it next fill up. Was getting ready to switch over to synthetic trans fluid for towing and wondering if that will contribute to better mpg. Always had 14-15 in city and no better than 17 hwy with 285 tires. Getting ready for gauges this month and maybe tunes later on.

2002 lariat F250 CC,4x4, 145k, MBRP exh, AFE II, 6.0 cooler, EBV delete, IAH delete, Firestone air bags, led headlights, revelco, autometer pyro & trans temp, retrax, 2013 artic fox 22H, husa FE250
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post #17 of 21 (permalink) Old 07-10-2016, 04:10 PM
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I had a stock 99 7.3 and it got 17 mpg and I drove it pretty hard..

1997 F350 CC, 7.3
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post #18 of 21 (permalink) Old 07-31-2016, 10:14 PM
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As a new DP Tuner Infinity owner, I must say "Amen" to RT's comments.

Wonderful product with great customer service!
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post #19 of 21 (permalink) Old 09-15-2016, 11:06 AM
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Lucky. My bone stock 7.3L drw has never gotten better than 14 mpg, hand calculated. Towing gets around 7 mpg...

2001 F-350, 7.3L, Crew Cab, 4x4, Dually.
202,000 miles, and going strong.
4" Turbo Back MBPR Exhaust
S&B Cold Air Intake
DP-Tuner F5 Chip
6.0 Trans Cooler

It likes to pull a 44' 3" 2016 XLR Thunderbolt 420AMP Toy Hauler
ISSPRO 3 gauge (pyro, boost, trans) pillar install.
Located on Long Island, NY
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post #20 of 21 (permalink) Old 09-16-2016, 09:06 PM
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I got 14 once (with a 30mph tailwind) avg 12 and 7 LOL

03 f-350 CC 4X4 Dully PSD Jody's 40tow\80econo\80 tow\120race Autolite Cobbalt Pyro, Trans Pillar mount, AFE Stage 2 proguard7, 4" turbo back
03 34' Rampage Toy Box 17000# with toys
16 RZR XP4
Misc. Quads and bike
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post #21 of 21 (permalink) Old 09-18-2016, 08:32 AM
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I know my 2000 f350 drw 4x4 used to get 16 highway and over the years had dropped to 10. I had hoped that the new injectors and such that I just installed would get my mileage back but alas it would seem that I only get 11 now. I'm sure some of that is due to the 285 mudders I'm running now vs the stock 235/85 or even the first size swap to 265s which are the same height just wider than the 235s.... I have simply resigned myself to being happy with the truck and not worrying about the mileage.
As for tunes, I only have experience with gearhead and will continue to recommend them as my experience has been good. Gearhead is also local to me so that's an added value. Can't say anything about any of the others other than I know you want good custom tunes and not off the shelf canned tunes.


2001 F-450 4x4 XL CrewCab Flatbed (Loved this truck, sold it to a friend and he says he will never sell it!)
2000 F-350 4x4 Lariat LE CrewCab Flatbed - 325k miles all stock, needs some maintenance but still going strong! (My daily driver)
1999.5 F-350 XLT CCSB - 335k all stock (now a parts truck)
2002 F250 CCSB 4x4 previous owner threw a lot of aftermarket money at it with little gain, added a TS6 w/Gearhead tunes. (Brother's daily driver)
2001 F350 CCLB - 180k all stock (Sister in laws daily driver)
2005 Ford Expedition (Wife's daily driver)
Wife is patiently waiting for the right Diesel 4x4 Ecursion to show up....
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And many other non-Ford vehicles...
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