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Old 04-19-2016, 03:41 PM   #671 (permalink)
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Hey, Basjoos,

I just went back and looked at #1 and noticed where you said LED replacement headlights "are several years off."

That was in 2007. It is now several years later. Any thoughts on that score? You had stated that you guesstimated the headlight use (due to considerable nighttime driving) was costing you around 2-3mpg, rather a noticeable dip into the results, and only noticeable because your fuel consumption is otherwise very low. It might be one of the few vehicles where the headlights' signal is clearly discernible against the noise of other loads.

Lots of LED headlight options out there now, and some of them don't suck. Thoughts?

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Old 08-17-2016, 01:16 PM   #672 (permalink)
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If I still had my old job where I had to do a lot of night driving, I would likely have done it when a bulb burned out. But if the LED's actually do outlast several replacement sets of halogen bulbs, then the conversion becomes cost effective. I currently do very little night driving now, but whenever a bulb does burn out, I might consider it.

Just passed through 600,000 miles on my odometer.
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Old 08-17-2016, 02:42 PM   #673 (permalink)
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I swapped my H-4 halogens for LEDs with cooling fans. The light is whiter but the pattern gets lost because the LEDs are not all at the same focal point. I applied a field expedient fix, but they make better DRLs than night-time lights.
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Old 11-16-2016, 09:32 AM   #674 (permalink)
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I made a trip up to the NC mountains a few weeks back and saw the effect that altitude has on mpg. At 400 feet elevation at 55mph, 15" of manifold pressure, and 85 degrees my SuperMID shows 100mpg. At 2100 feet elevation those same parameters show close to 120mpg. The mpg improvement would be due to a combination of reduced aero drag in the thinner air and the 15" of manifold pressure at 2100 feet elevation resulting in a wider open throttle plate for reduced pumping losses. I wonder what it would show at 6000 feet, not that there are any flat, straight road stretches to try this on in the eastern US.
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Old 11-16-2016, 10:53 AM   #675 (permalink)
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Quote:
Originally Posted by basjoos View Post
I made a trip up to the NC mountains a few weeks back and saw the effect that altitude has on mpg. At 400 feet elevation at 55mph, 15" of manifold pressure, and 85 degrees my SuperMID shows 100mpg. At 2100 feet elevation those same parameters show close to 120mpg. The mpg improvement would be due to a combination of reduced aero drag in the thinner air and the 15" of manifold pressure at 2100 feet elevation resulting in a wider open throttle plate for reduced pumping losses. I wonder what it would show at 6000 feet, not that there are any flat, straight road stretches to try this on in the eastern US.
I have a stretch of road between Steamboat Springs and Laramie WY where the elevation is over 8,000 feet for much of the trip. In that thin air I can hit 70@70 where mpg and speed are the same. At lower elevations I have to drive much slower to come close to those numbers. And the diesel doesn't have a throttle plate like a gas engine.

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