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Discussion Starter #1
Is this possible or did I just get a couple tanks of the good stuff?

The math-844.9 miles / 45.4 gallons

The truck-2000 ECSB 4x4 33s leveling kit, ZF6, SRP1, 350/200s, Gearhead tunes, Sump/RR, 76mm Billet PTE DBB. Amsoil in the motor/tranny/diffs.

The driving-75% was with the cruise at 55-65 mph, 15% on gravel roads at 40-50 mph, the other 5% was conservative stop/go, the other 5% was having fun :evil

Been tweaking with AE to get the tire diameter number dialed in...so the speed on a Garmin matches the odometer, and average timing over 2 or 3 mile markers. Got it nailed before this tank(s)...so now the Garmin/odo match at 70 mph.

Not complaining...just wasn't expecting it, and wondering if there's more to be had :eek:
 

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Thats awesome. Really shows that a big injector can still be efficient. Good post.
 

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Not out of line in my opinion. I got 19.3 in my rig but granted that was in very favorable wind conditions and 80% interstate @65mph. I was deffinately stoked.
 

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Discussion Starter #5
Really good!

Best I can get on my big stuff is 14.5mpg. I suspect that my large turbo results in less efficiency under low load conditions.
I'd like to look you up the next time I'm in south central Tx. Meant to do it a couple months ago on my last trip there.

Based on your tuners fuel vs. boost strategy, I'd thought otherwise...low boost=low fuel. If that's wrong...square me a way. Not debating...just throwing another viewpoint out there.

My old crusty non-built factory motor...isn't making near the power yours is...that might have something to do with it as well.

Have you verified your odometer/speedometer with a GPS by chance? You might be getting better mileage than you think. AE can correct for nonstandard tire sizes...
 

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Discussion Starter #6
Thats awesome. Really shows that a big injector can still be efficient. Good post.
Thanks! I thought it might be lucky math...but this is the second 600+ mile/2 tank scenario where the math lined up over 18 mpg. Clipped the internal vent lines nearly flush with the tank when I dropped it for the sump install...so can fill the tank "to the brim" pretty consistently now....so feel pretty confident in my calculations now.
 

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Discussion Starter #7
Not out of line in my opinion. I got 19.3 in my rig but granted that was in very favorable wind conditions and 80% interstate @65mph. I was deffinately stoked.
19.3!? So there is more to be had :eek: Are you lifted? Tire size? Truck config (EC/SC/SB/LB)?
 

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Discussion Starter #9
Good number V-Ref!!!

What are you running for gearing!!

Thanks!!
Stock 3.73LS. Used the AE function to correct tire size until GPS speed and Odometer needle speed matched. Verified time over 2 and 3 mile markers. :shrug:
 

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19.3!? So there is more to be had :eek: Are you lifted? Tire size? Truck config (EC/SC/SB/LB)?
Stock lift, cc/lb, 275/70/20 tires. Again this is with very favorable condition and lenient driving. Hand caclulated. Only hit that once, but been in the 17-18 a couple times.
 

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That's fawkin awesome!
 

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The 7.3 has excellent mileage potential.
If I could have found one w/ adjustable pedals I would have traded my 02 for another 7.3 due to mileage.
The 6.4 has a LOT of power w/ just a tuner but the mileage is soooooooo touchy. In town i see 15ish hwy 18. My bone stock 7.3 got a best of 21 and ave 18-19, in town or hwy, hot or cold, street or desert, it didn't matter much.
 

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Discussion Starter #14
Just a quick update on this issue....the ol' 7.3 dinosaur....

Been pulling an average of 17.8 to 18.3 mpg (hand calculated, don't have a trip computer:() on the last 6 tanks of fuel now. GPS and digital clock/mile marker verified that my AutoEnginuity tire size calibration is as close I can calibrate it (within 1 mph at 70 mph). Driving has consisted of 75% highway at 60-65 mph, 20% gravel/off road, and 5% dyno runs. 7400 lb ECSB truck with a bed cover, 33s, and a leveling kit. Nothing earth shattering...just saying big injectored trucks with the right tuning, driving technique and supporting mods (ICs, air filter, exhaust) can do pretty darn well.
 

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Discussion Starter #15
Re: 400cc/200% 19.2 mpg

19.16 mpg
391.7 miles
20.44 gallons

90% highway/cruise control 55-65 mph (gusty winds +30 mph)
10% dirt/gravel 15-35 mph
50%/50% Gearhead Tune #2 and #3 of 6

Thanks Matt!
 
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