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Old 09-14-2015, 09:19 PM   #1 (permalink)
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JRMichler's Avatar
Join Date: Feb 2011
Location: Phillips, WI
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Nameless - '06 GMC Canyon
90 day: 35.1 mpg (US)
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Test of P&G vs DWL

I finally did a test of P&G vs DWL on the highway. Conditions were ideal for a P&G test - no traffic behind me, level road, 65 degrees, and a light tailwind. MPG is from my Scangauge, which reads about 5% or 6% low. I do not bother to better calibrate it because the relative readings are good.

A stretch of DWL resulted in 36 MPG on the Scangauge. The road is level, with slight rises and falls of 2 to 4 feet. I tested P&G between 50 to 55 MPH, timed to take advantage of the road undulations, slight as they were. Results: P&G gave me 40 MPG.

I do not normally P&G on a level road because glide distances are shorter than the accelerations. A typical 50 to 55 pulse and glide is less than a mile. And because gliding below 55 MPH in a 55 limit on a two lane road with limited passing is too rude.

The MPG difference between DWL and P&G increases at slower speeds, and with larger speed differentials.

The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
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Old 09-15-2015, 11:54 AM   #2 (permalink)
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Thanks for sharing your results.

Current project: A better alternator delete
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