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Re: From 3.23 to 3.55 Hwy mileage drop?
[Re: ragtop]
#997603
05/24/11 09:15 AM
05/24/11 09:15 AM
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Joined: Jan 2006
Posts: 8,162 USA
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Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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Quote:
Thanks. What was your hwy mileage, just to see what percent, your 1 MPG is?
Depending on wind and air temperature, after the 3.21 diff gears were installed MPG at a steady 70 mph over this route varied from 18.7 to 19.2
This was with 87 octane Exxon gasoline, which back then did not have 10% ethanol in it.
The 2wd truck also had a ARE brand tonneau on the 6.5 foot long cargo box.
With a girl friend working at the Blockade Runner Hotel, and me living in Durham and going to graduate school during the week, I did this trip frequently, and also tested running with the 1995 MP PCM engine controller on 93 octane, running without the factory front air dam, running without a radiator fan, running without the air intake tube that goes from passenger side fender to air cleaner box so that the throttle bodies got hotter air, running with/without KN washable drop in air filter, running with 180, 195 and 205 degree F thermostats, running with/without AC on, running with aerodynamic vortex generators magnetically attached to rear of roof, and a few other mods.
First main thing I learned: wind direction and speed has more effect than most vehicle owners realize, and every test run needs to be adjusted to take that into account if you are testing with a single vehicle.
Second main thing I learned: Claude Travis, known as 'Mr MPG' in the 18 wheel truck testing world, knows a lot about how to properly test trucks for modifications, and incorporated his wisdom into the TMC/SAE Type IV test procedure.
http://www.landlinemag.com/Archives/2004/May2004/Bottom_Line/Does_it_work.htm
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