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