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Old 02-02-2007, 01:35 PM   #31
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On a metro anything less than 5 inches of vacuum and it goes into power mode and the oxygen sensor goes over .9V so you have to go really slow up a hill in a metro to keep it over 5in. I normally have to go up hills with a 10% or greater grade so I can say for sure it doesn't help mileage. You can't engine off coast unless you are willing to get to 80-85mph on the downhill part and there is no sharp curve at the bottom of the hill that you have to make. A Metro is not that aerodynamic so getting it to 80 coasting means a pretty steep hill. My Camaro will happily go well over 90 going down those hills but I normally brake and keep it slowed down some. The aero losses from the high speeds downhill and not being able to keep it out of power enrichment mode unless you want to go 15mph up the hill in 3rd. Those two things usually make mileage on hills worse for me. I would say power enrichment mode in 4th-5th still gets better mileage than normal mode in 3rd due to the difference in engine speeds.

But I guess a slight incline might be helpful but anything with any kind of angle to it does not seem to help get better mileage.
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Old 02-02-2007, 06:25 PM   #32
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Originally Posted by skewbe View Post
Ok, two more questions:
1. you've verified the odometer/scanguage/mile markers/google earth. What about fuel consumption? I'm reasonably sure you would cross check what the pump says you used and what the scangauge says you used, and use the "fillup" feature to calibrate your scangauge, per the instructions, but I would like confirmation.

2. in your experience do the mountains help mpg or hurt vs flatlands? (Yes' it's pretty darn flat here)

re: 39mph tight hilly corners, sounds exciting
1. I do cross check. Last tank was right on. I have been filling my tank by letting pump shut itself off, then 1 more shutoff. I have not used any correction for some time because figures are close. I would rather believe the ScanGauge for fuel useage than the pump with other fillup factors. I use actual pump gallons and ScanGauge miles(always slightly lower than speedo miles, also lower than Google Earth plots). when I enter fillups in my gaslog.

2. I have not done very much flatland driving since I got on the gas mileage kick. I have made some serious adjustments to my driving to make mountainous driving work, but I would have to say my overall results speak for themselves.

3. re 39mph tight hilly corners, sounds exciting [/quote]
My most recent trip on this stretch was on a snowpacked road. Could not make myself even try to make time. I will not do this again. I will wait for dry roads. Where are you located?
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Old 02-02-2007, 06:32 PM   #33
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Originally Posted by Coyote X View Post
On a metro anything less than 5 inches of vacuum and it goes into power mode and the oxygen sensor goes over .9V so you have to go really slow up a hill in a metro to keep it over 5in. I normally have to go up hills with a 10% or greater grade so I can say for sure it doesn't help mileage. You can't engine off coast unless you are willing to get to 80-85mph on the downhill part and there is no sharp curve at the bottom of the hill that you have to make. A Metro is not that aerodynamic so getting it to 80 coasting means a pretty steep hill. My Camaro will happily go well over 90 going down those hills but I normally brake and keep it slowed down some. The aero losses from the high speeds downhill and not being able to keep it out of power enrichment mode unless you want to go 15mph up the hill in 3rd. Those two things usually make mileage on hills worse for me. I would say power enrichment mode in 4th-5th still gets better mileage than normal mode in 3rd due to the difference in engine speeds.

But I guess a slight incline might be helpful but anything with any kind of angle to it does not seem to help get better mileage.
One suggestion. Rather than riding the brakes to slow down, I just put in gear with injectors still shut off and use engine for braking. No fuel used. This will also replenish vacuum for power brakes.
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Old 02-02-2007, 06:37 PM   #34
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Originally Posted by skewbe View Post
do the mountains help mpg or hurt vs flatlands? (Yes' it's pretty darn flat here)
Maybe this doesn't apply - I see "hills", not mountains - but I'd say "depends on their shape". When presented with the option, I'll always choose a route that has a hill with a short, relatively steep "up" and a long, gradual "down" over a flat route.
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Old 02-02-2007, 06:37 PM   #35
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http://www.gassavers.org/showthread.php?t=2173

here's his introductory thread and shows the mods he was working on. he's snowed in rioght now ands comes here when he can.
Thanks, Lx. My bodyguard. I didn't see this thread till late yesterday.
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Old 02-02-2007, 06:44 PM   #36
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One suggestion. Rather than riding the brakes to slow down, I just put in gear with injectors still shut off and use engine for braking. No fuel used. This will also replenish vacuum for power brakes.
This is exactly what I wanted to know!!!! Is this a general rule for all cars? Would the power steering also be replenished?

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Old 02-02-2007, 06:47 PM   #37
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Maybe this doesn't apply - I see "hills", not mountains - but I'd say "depends on their shape". When presented with the option, I'll always choose a route that has a hill with a short, relatively steep "up" and a long, gradual "down" over a flat route.
How do you get back home?
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Old 02-02-2007, 06:56 PM   #38
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Last time I looked close I had 2400 at 55. That would make 60 close to 2600.
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Old 02-02-2007, 07:00 PM   #39
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This is exactly what I wanted to know!!!! Is this a general rule for all cars? Would the power steering also be replenished?

CarloSW2
Engine driven power steering would operate as normal as long as engine was turning, but no reserve as with brakes.
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Old 02-02-2007, 08:42 PM   #40
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One suggestion. Rather than riding the brakes to slow down, I just put in gear with injectors still shut off and use engine for braking. No fuel used. This will also replenish vacuum for power brakes.
That's it exactly.
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