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Gents:

I have a 2006 997s. I changed the oil myself at 1800 miles ( 1 year ) , a very easy procedure and much less expensive than the local Porsche dealer. ( Mobil 1, 0w40 ) Before the oil change, I was getting 14.5 mpg. Afterwards, my fuel consumption dropped dramatically to 23 mpg. I am totally sure my driving habits have not changed. Has anyone experienced the same change?

Thanks,

Larry, North County San Diego

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Gents:

I have a 2006 997s. I changed the oil myself at 1800 miles ( 1 year ) , a very easy procedure and much less expensive than the local Porsche dealer. ( Mobil 1, 0w40 ) Before the oil change, I was getting 14.5 mpg. Afterwards, my fuel consumption dropped dramatically to 23 mpg. I am totally sure my driving habits have not changed. Has anyone experienced the same change?

Thanks,

Larry, North County San Diego

Did you mean dropped or increased? Either way I changed my oil at 1900 miles and did not notice any change in mpg, I was averaging 25.5 mpg before oil change and average is now (3000 miles) 25.1 Best recorded mpg before oil change was 29 (fully loaded, mostly motorway cruising at 80mph, <4000rpm) and best since has been 27 but with a mixture of road types and now using the car's full rev range. (Note: mpg figures are based on imperial gallon for equivalent US gallon multiply by 0.833, fuel mostly Shell 99 RON)

Edited by snarf
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Gents:

I have a 2006 997s. I changed the oil myself at 1800 miles ( 1 year ) , a very easy procedure and much less expensive than the local Porsche dealer. ( Mobil 1, 0w40 ) Before the oil change, I was getting 14.5 mpg. Afterwards, my fuel consumption dropped dramatically to 23 mpg. I am totally sure my driving habits have not changed. Has anyone experienced the same change?

Thanks,

Larry, North County San Diego

Did you mean dropped or increased? Either way I changed my oil at 1900 miles and did not notice any change in mpg, I was averaging 25.5 mpg before oil change and average is now (3000 miles) 25.1 Best recorded mpg before oil change was 29 (fully loaded, mostly motorway cruising at 80mph, <4000rpm) and best since has been 27 but with a mixture of road types and now using the car's full rev range. (Note: mpg figures are based on imperial gallon for equivalent US gallon multiply by 0.833, fuel mostly Shell 99 RON)

Sir:

My fuel consumption improved from 14.5 mpg to 23mpg. I drive city and freeway miles ( not many however ) Punch it once in a while. My point is that my mpg improved after the first oil change.

Thanks

Larry

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Sir:

My fuel consumption improved from 14.5 mpg to 23mpg. I drive city and freeway miles ( not many however ) Punch it once in a while. My point is that my mpg improved after the first oil change.

Thanks

Larry

Larry, apologies, your meaning was clear - I should take more care when reading posts.

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Wow, 25 mpg!!!. Is that highway or combined City and Highway? My best is 22 mpg on highway avg 85mph. If everyday city driving, I get 19 or so. I don't think I have lead feet. I figured my mpg is the norm, Is it ? Board? I am happy w/ 22mpg. But if 25 mpg is the norm, What am I doing wrong?

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Wow, 25 mpg!!!. Is that highway or combined City and Highway? My best is 22 mpg on highway avg 85mph. If everyday city driving, I get 19 or so. I don't think I have lead feet. I figured my mpg is the norm, Is it ? Board? I am happy w/ 22mpg. But if 25 mpg is the norm, What am I doing wrong?

My circa 25mpg is per imperial gallon this equates to around 21mpg per US gallon. Also I never start the car unless its for a minimum of a ten mile trip, I avoid rush hour and traffic hot spots wherever possible and I have only once used less than 99 RON fuel.

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  • 3 weeks later...
  • 4 weeks later...

19.7 mpg US. It doesn't budge. I think it's a number the factory etched in the indicator screen to make you think it changes... :jump:

My numbers range from 14 mpg (US) (when really playing) to a bit over 24 mpg,--when on a highway and not starting and stopping. Cruise set at 70 mph. This, with a VERY full cabrio and h/top.

Dan

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