Am I doing it wrong? Bad MPGs?

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Re: Am I doing it wrong? Bad MPGs?

Postby cmann250 » Fri Jan 27, 2012 7:51 pm

Here's my $.02. Your daily driving route looks like all city to me. Getting 14.5 mpg out of a 4x4 dually in the city is pretty good in my mind. To give you a comparison, my regular cab non-OD 2wd truck gets 18-19 on summer fuel. Granted I tow hay wagons almost everyday and I almost never spend more than 30 min at 55-60 mph. The best tank I have ever gotten was 20.8 mpg.

I hate to say it, but you may be at the peak of efficiency
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Re: Am I doing it wrong? Bad MPGs?

Postby 142autox » Fri Jan 27, 2012 8:19 pm

Not really "city", I don't ever spend time in traffic wishing I could move forward a few feet, more reach cruising speed and maintain that for a few miles then stop for a stop sign.

You're getting 18-19 towing without od?
93 W350 dually, A518. DDP stage 1 injectors, and typical pump adjustments.
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Re: Am I doing it wrong? Bad MPGs?

Postby cmann250 » Sat Jan 28, 2012 3:24 am

142autox wrote:You're getting 18-19 towing without od?

Most days during the summer I pull hay wagons back to the farm (<5 miles) and thats going no faster than 30 mph. If I were to guess a wagon weighs 10k (75 lbs per bale x 125 bales plus 1000 lbs for the wagon). 19 is rare, but I expect 18. I also have 3.07 read end gears
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Re: Am I doing it wrong? Bad MPGs?

Postby 142autox » Tue Feb 14, 2012 6:40 pm

Update. I initally tuned the starwheel down 1.5 turns and rotated the pin to the deepest side, but in the quest for better economy I turned the starwheel back to stock and then up two full turns. I figured the bigger injectors would make up the boost to still have full use of the pin. I was right, in fact I went from 25psi peak boost to 27psi :scratch:.

I went from 14ish mpg to my last calculated mileage of 16.7mpg. I also adjusted my driving style so I dont know for sure which is responsible. Instead of slowly acclelerating to speed and having little maintained speed miles before stoping, I started accelerating with around 10lbs boost to speed and then maintaining speed.

I'm going to try more starwheel adjustment and turning the "smoke screw" up and see if I can get better.
93 W350 dually, A518. DDP stage 1 injectors, and typical pump adjustments.
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Re: Am I doing it wrong? Bad MPGs?

Postby Tsbourne09 » Mon Feb 20, 2012 8:06 pm

I average a little over 14... And all my parts/upgrades/filters etc are new. Lots of furl and power and it does get drove hard. I bet if i was easy onit i could get alot more!
93 D250- pump maxed, 3800 spring, hx35, denny T pump top, 7x.015 injectors, timing+, Coolertubz, raptor 150, boost nipple, 4" DP to 6" aussie stacks, built tranny, asa intake, DNR tps, more HP mods, isspro boost, fuel pressure, egt, tranny temp, 5k tach, chrome and powder coating here & there.
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Re: Am I doing it wrong? Bad MPGs?

Postby Diesel Dawg » Thu Feb 23, 2012 3:31 am

your getting pretty good mileage now for what you have :D
92 D-350 reg. cab,dually,c.t.d.,auto,3.54s,fuel screw 2+turns,smoke screw3 turns,star wheel all the way down,,B.H.A.F.,,gauges,DennyT stage 2 pin,366 spring next!!!
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