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  #1  
Old 07-10-2012, 07:51 PM
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12 MPG...?

It's looking that way for Nodoka as I have been trying a two-part test in fuel mileage. This first part consisted of putting gas in as though I was still getting 10 MPG, and then ran the tank to empty (sputter and die)...
I have still yet to reach that point, and I have long passed the empty point.

As I do know that this method isn't as accurate as filling the tank and then going, so that will be done this week.

This is after putting the power/economy valve back in service, re-tuning the carb, and adjusting the timing. The filters are going to be replaced so maybe there is still some more that can be done.
Yay!
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Last edited by CJ the noisemaker : 07-10-2012 at 07:55 PM.
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Old 07-10-2012, 09:48 PM
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What grade of fuel are you running?
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  #3  
Old 07-10-2012, 10:17 PM
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Quote:
Originally Posted by BGW
What grade of fuel are you running?
87 octane.
I range brand as well, Chevron, QT, 7-Eleven, etc.
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Old 07-10-2012, 10:27 PM
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Yeah, I've noticed sometimes that I get slightly better milage at altitude with the higher grades of fuel. Not to mention preventing pinging. I usually fill up with 87 too for around town, but if I'm going really far up then I'll go with 91.
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  #5  
Old 07-11-2012, 01:54 AM
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I always seem to do better with low octane in the mountains since Ethyl lead went away.
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  #6  
Old 07-11-2012, 03:43 AM
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Wink Seems counter-intuitive...

When up in Yellowstone a couple weeks back and cruising the Rockies I saw 85 Octane fuel again, for the first time in a long time.

Increased Altitude lowers boiling point, so higher Octanes not really needed. I'm sure the scientists in the crowd can give a more detailed answer why lower Octanes work up there.

I always thought that higher octanes meant hotter burn but a knowldgable Mechanic explained that higher Octane is actually a colder burn.

So the more I learn the less I know






Quote:
Originally Posted by Carnuck
I always seem to do better with low octane in the mountains since Ethyl lead went away.
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  #7  
Old 07-12-2012, 09:50 AM
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The modern higher octane burns slower due to additives to keep the fuel from "exploding" too soon and making the motor ping. There is less oxygen at higher altitude to help the fuel explode so slowing down the burn actually makes it worse.
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Old 07-12-2012, 01:28 PM
Mr Carts Mr Carts is offline
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In the wifes 06 Mustang, if I use Chevron or Shell 87, the Computer will give me an average of 28mpg on our weekly 180 mile round trip to church.

When using Arco or Valero it drops to 22 mpg same trip. I lock on
the curise control at 72 mph both ways.

Needless to say if you want better mpg and save money NEVER use Arco or Valero gas as you will burn about 20% more fuel than Chevron or Shell.
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  #9  
Old 07-13-2012, 10:16 AM
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That will depend on the vehicle. The injectors Ford uses will affect the spray when you have alcohol in the fuel (there is a fuel sensor that automatically fattens the spray to account for the alcohol)
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  #10  
Old 07-13-2012, 10:31 AM
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Quote:
Originally Posted by Carnuck
That will depend on the vehicle. The injectors Ford uses will affect the spray when you have alcohol in the fuel (there is a fuel sensor that automatically fattens the spray to account for the alcohol)

My understanding is that the pre-cat O2 sensor is what decides what the injectors will do, since its job is to tell the computer how much O2 there is, and the computer adjusts accordingly (along with mass air flow sensor input) to keep the mixture as close to 14.7:1 as possible.
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  #11  
Old 07-13-2012, 10:42 AM
Ristow Ristow is offline
 
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this whole thread makes no sense to me. how do you "put gas in as though you're getting 10mpg"? and if you were able to figure out you previously were getting 10mpg,why can't you just use the same mathematics to figure current mpg's?


at 12mpg's i'm looking for the problem.
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  #12  
Old 07-13-2012, 11:09 AM
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I'm not 100% sure, but it seems like the gas gauge may not be working so the fuel content is estimated (10 mpg with 26 gallon tank means looking for gas again when you reach about 250 miles)
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  #13  
Old 07-13-2012, 12:16 PM
Ristow Ristow is offline
 
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Quote:
Originally Posted by Carnuck
I'm not 100% sure, but it seems like the gas gauge may not be working so the fuel content is estimated (10 mpg with 26 gallon tank means looking for gas again when you reach about 250 miles)



what does the fuel gauge have to do with filling the tank,then dividing miles by gallons? my gas gauge in the cherokee hasn't worked in over a year. i can still figure the mileage tho,every time i fill up. the gas gauge has never been a factor in my mpg calculations.


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  #14  
Old 07-13-2012, 12:57 PM
joe joe is offline
 
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Quote:
Originally Posted by Ristow
what does the fuel gauge have to do with filling the tank,then dividing miles by gallons?
What? mpg is miles per gallon and not miles per gauge?
For anyone figuring mpg's using the gauge I strongly suggest you carry a good pair of walking shoes in your tool box.
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  #15  
Old 07-13-2012, 01:01 PM
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Quote:
Originally Posted by Ristow
this whole thread makes no sense to me. how do you "put gas in as though you're getting 10mpg"? and if you were able to figure out you previously were getting 10mpg,why can't you just use the same mathematics to figure current mpg's?

I'm with you.
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  #16  
Old 07-13-2012, 02:34 PM
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CJ the noisemaker CJ the noisemaker is offline
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Guys, ever since I was messing with the vacuum lines I constantly got 10 MPG based on the ODOMETER. Yeah I know there is offset, but I also put that into calculation.

The real test began today when I filled the tank... It only holds 17 gallons now due to the big dent on the shield
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  #17  
Old 07-13-2012, 02:45 PM
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That doesn't explain how you "put gas in as though you're getting 10mpg"?
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  #18  
Old 07-13-2012, 02:55 PM
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CJ the noisemaker CJ the noisemaker is offline
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Quote:
Originally Posted by hummer010
That doesn't explain how you "put gas in as though you're getting 10mpg"?
Simple.
3 gallons of gas X 10 MPG, Drive to 30 miles after putting in the gas, then put in more. Exact levels will reduce the chance of botching the test.
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  #19  
Old 07-13-2012, 07:33 PM
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Testing gas mileage by putting in X amount of fuel and running it until empty seems pretty pointless to me when u can top it off, drive, top it off and then divide.
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  #20  
Old 07-13-2012, 07:46 PM
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T4HALO T4HALO is offline
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my 76 with the AC on and doing 70 got 12.5 mpg last week. I have got 14.3 at 65 mph without the AC on. I need to rebuild the carb, may get a little better.

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