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Old 04-21-2015, 10:05 PM   #71 (permalink)
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The numbers when you were really trying are amazing, and as far as that goes, the high 30s are too, just not compared to 57.

This thread is almost making me wish I had stayed in my search for a (5.9 or 7.3) diesel truck before getting my car. Almost.

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Old 04-22-2015, 01:27 AM   #72 (permalink)
Wannabe hyper..., miler !
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Originally Posted by ME_Andy View Post
You lost the weight for mpg reasons, didn't you?
That must have been it! MPG enthusiasm..., that's right, NO?
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Old 04-22-2015, 06:58 AM   #73 (permalink)
Not bad for a machine
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Maechunbu - Retired - '00 Kia Sephia 1.8I4 16VDOHC
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thanks for posting. I love the pickup!

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Old 04-22-2015, 08:08 AM   #74 (permalink)
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Great to hear from you Dave! Your presence around here was always appreciated.
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Old 05-06-2015, 06:58 PM   #75 (permalink)
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Diesel dave what mods do you have on your truck I have a 2009 ford that gets no where near that mileage. Would love to get some dramatic increase like you've had
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Old 05-07-2015, 07:09 AM   #76 (permalink)
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Someone needs to let DD borrow their civic or metro. I think he could get about 300mpg out of it.
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Old 05-07-2015, 07:55 AM   #77 (permalink)
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It's the nut behind the wheel folks. I can show you a graph produced by gubbmint funded entities that PREDICTED THAT FUEL MILEAGE. The document was produced 9 years ago.
His focus changed to his weight and physical well being. I'll take high 30s and my health anytime.

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Old 05-09-2015, 01:59 PM   #78 (permalink)
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Have you ever used the white whale for its intended purpose, hauling heavy stuff? If you have, what sort of numbers did you pull doing it?
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Old 05-11-2015, 03:53 AM   #79 (permalink)
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2004 CTD - '04 DODGE RAM 2500 SLT
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Towing heavy

The difficulty of predicting tow mileage is the shape of the load, not the weight so much.

This truck type is fairly immune to payloads around 1,000-lbs, but then one must account for the number of acceleration and deceleration events. Payload is around 2,000-lbs.

If one used a U-HAUL trailer as control (the 6 by 6 by 12 unit; tandem axle) and kept the gross combined weight to recommended spec 2k on truck including trailer tongue weight and 4k on trailer, for a combination gross of around 13k one would have a setup for comparison across the other factors which go into FE comparisons (truck spec, climate, and terrain).

It's not the absolute number, it's the percentage change from solo.

Probably easiest to chart a two- hundred mile highway loop where the vehicle is fueled after about 30-miles, the test loop is run, and then refuel. This is a loop short enough that one stop suffices.

The towing rule of thumb is to deduct 30-40% from solo mpg over the same course with a travel trailer. That is with any spec vehicle; 1965 or 2015 MY. And it works well enough for an enclosed cargo trailer.

With the above trailer and the load stated over a seven hundred mile round trip I saw a deduction of just under 30% in a truck similar to Daves along the Texas Gulf Coast (warm climate and flat terrain). Known limited stops, the use of cruise control and at 58-mph.

Dave would likely not use CC, is in a cooler climate with rolling terrain, and would probably start from a solo mpg of 32+. I'd imagine he could keep the towing deduct to nearer 25% for the given load and his more challenging conditions.

Last edited by slowmover; 05-11-2015 at 04:03 AM..
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Old 05-11-2015, 11:18 PM   #80 (permalink)
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The aero penalty you get with the trailer huge compared to the weight.
In my diesel suburban it takes around 500lb of cargo to reduce fuel economy 1mpg.
Just putting my small trailer behind it which weighs about 250lb empty and costs me any where from 2 to 4mpg without anything in it.

1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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