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Old 01-24-2008, 09:38 PM   #1 (permalink)
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been playing with pulsing and coasting...

In my 04 Nissan Frontier, crew cab, short bed, with the tall suspension.
Albiet not the best for gas mileage but this quarter of a tank seems to be lasting forever!
I'll get some MPG numbers on the next tank. Seems to to the best between 55-60MPH. Above that drag is just horrible. Which makes sense since aerodynamics start playing in around 60mph... and the truck is a brick...red and all. LOL
I'm guessing that I'm getting around 25-27MPG. I normally get 17.5-21MPG depending on if it is highway or city driving which is the EPA estimate for the vehicle.

Hope to get some real numbers after the next tank!!!
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Old 01-24-2008, 09:59 PM   #2 (permalink)
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Well, congrats on the (maybe) good news.

I hope you can turn out those numbers in the mid 20's. Either way, one green leads to another.
"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.

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Old 01-26-2008, 09:39 AM   #3 (permalink)
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Sounds like you need a ScanGauge - then you don't have to "guess" about how well you're doing!

A note on aerodynamics: drag doesn't "start" at 60 mph. It's a common misconception, though. (Ride a bicycle and you know that aero drag is present - and a significant factor - even at 10 mph.)

As a proportion of fuel burned to move your pickup down the road, @ roughly 30 mph, 50% of your power is spent overcoming aerodynamic losses, and the other 50% is spent on rolling & mechanical losses.

Above that speed, the proportions continue to tilt towards fuel burned strictly overcoming aero losses.
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Old 01-28-2008, 09:32 AM   #4 (permalink)
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You're right that drag rises faster than your speed, so keeping it slow and easy is a big step toward improving the mileage in your ride.

25-27, that's pretty good, esp. in a 4x4. Even out of 4-wheeler mode, all that extra driveline and the big chunky tires present a lot of drag to the wind.

If your truck is jacked at all - even factory raised - there's probably a lot of space in those rear wheelwells with nothing in it. Add skirts and close off those big air buckets.


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