| Author |
Message |
    
Eric Pena (Evalp)
| | Posted on Sunday, January 26, 2003 - 12:50 pm: | 
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I was having a miss fire on 8 and got my plug and wire replaced by the dealer under warranty on my '00 DII. I was getting 300 miles to the tank before that and am now getting 250. The dealer gave me some story of the gas now having an additive to it causing worse MPG. Is that at all true of was I getting a story. I don't remember what she said it was but it was not ethanol or oxygenation.
That might explain other peoples question of drops in MPG if it is true. I am not getting a check engine light so the engine 'thinks' it running OK. |
Eric Pena (Evalp)
| | Posted on Sunday, January 26, 2003 - 11:00 pm: |
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No one knows anything? |
Jason Vance (Jason)
| | Posted on Monday, January 27, 2003 - 01:47 am: |
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Nope. MPG is mysterious, can change due to a number of reasons, including:
changes in routes
% of highway driving relative to % of city driving
time spent idling
your lead foot
average elevation ascending and descended
wind speed and direction
average payload
tire pressure
temperature
gasoline octane and quality
whether you are using one of those Tornado doo-hickies
average speed and gear used
elves
You see, there is a lot that may affect mpg. On our D1, prior to Christmas, we were averaging about 280-300 miles per tank. After a lengthy trip from Vegas to Oregon and back (where we were getting about 350-375 miles per tank on the highway), we are now getting between 325 and 350 miles per tank. Likely, something about the gas changed, but I could attribute the differences we've experienced to any number of factors on the list above (we dropped the Elves off at Keebler on the way back). |
Kennith P. Whichard III (Kennith)
| | Posted on Monday, January 27, 2003 - 06:28 am: |
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Yes,
It has been mentioned here that certain places put additaves in their petrol during winter. I have personally found that for the American specification Discovery Series IIs actually prefer 95 octane fuel rather than 91 as written in the manual, due to a different compression ratio than their british counterparts.
Try ultra 94 once and see the difference.
Cheers,
Kennith |
Paul Long
| | Posted on Monday, January 27, 2003 - 08:40 am: |
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Eric, As Kennith suggests, what fuel grade are you using? Always from the same station? If I try 89 octane, mileage drops drastically. I have to mash it pretty good to get it to upshift with lower octane as well. I swear I've gotten 89 at the 91 pump at one station more than once, obviously I don't go there any more. OBD2 code reader has a function that shows long and short fuel trim. That's the only way I know to tell what's going on with components. (Other than having the dealer check it with 'test book' a similar program)If it was setting a code before you had them take care of #8, it's possible that it came up with more than just 1 misfire code. If it came up with "lean bank 1 or 2" they may have done something else to richen it up?? I don't know if Test Book is capable of programming the ECU differently, without rechipping, but I know it can update/change some programs in it. |
Mark Albrecht (Markalbrecht)
| | Posted on Tuesday, January 28, 2003 - 06:33 pm: |
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50 miles a tank is a pretty big drop, but certain poor air quality regions use gas additives in the winter to maintain emmissions/clean air required levels. Seattle and So.Cal. do for example. I don't know about CO. Ask at the gas station or read the warning on the pump. |
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