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Old 11-12-2019, 05:39 PM   #11 (permalink)
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Quote:
Originally Posted by Fat Charlie View Post
OE cluster MPG displays are about as accurate as a presidential hurricane forecast.



Get a ScanGauge or UltraGauge, spend some time getting it calibrated, and then use the short trip measurement to ABA test your mods.
If OP is running anything but stoichiometric, a Scangauge or Ultraguage will be really inaccurate too, as they don't use air-fuel ratio in their calculation. The way to get accurate numbers in a lean burn vehicle is with an MPGuino.

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Old 11-12-2019, 10:38 PM   #12 (permalink)
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The display number is relative. As a value. Mines off 11% at 60-mph. A glance tells me how I’m doing after correction. The main value is in checking against current road conditions. As a tank for me is in excess of 700-miles, the display rarely is left alone.

As to mpg:

A fuel stop 50-60 miles out from home. Warmup (including tires) is done. Fill to first auto shutoff. Then, a drive of 100 or more miles. Make the midway turnaround at a deserted crossover to avoid stopping.

Run about 62-64/mph. Keeps you under commercial traffic, but not so they jam up behind you. 100% cruise control use. No lane changes. Cancel cruise to get groups around you (drift down to 55; use terrain to re-engage cruise: let the computer handle the drivetrain). No accel or decel. Note exceptions.

Back to same pump and refill same way.

A baseline which anyone can copy. This is the most important consideration.

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2004.0 DODGE Ram QC/LB 2500 2WD/NV-5600 305/555 ISB. 7,940-lb. Stock. 200,000 miles/5000-hrs @ 40-mph average.
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Old 11-17-2019, 12:48 PM   #13 (permalink)
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