91 or 94 octane gas.

[WildHorse]

I must disagree and do think the list of things made bold can affect fuel economy and reliability for sure and very likely emissions to some degree. Raising the rev limit clearly can affect reliability as well as fuel economy.

I'd rethink your thought process.

Since you don't own a V-8 S550, I'll give you some real world example(s).

I didn't lose any MPG due to the tune. Going from 3.31 gears to 3.73 I took a .5 mpg hit. Big deal, and NOT tune related.

My car was tuned since it had about a 1000 miles.
Limiter was raised from 6500 to 7800.
Reliability is the same now, as it was then.

Dollars to donuts my car would pass a emissions test, but since I deleted the cats, hard to test. I also gained about 1.5 MPG & 25HP with the cat delete. So now I make better MPG than the EPA's published DATA.

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[sk47]

I'd rethink your thought process.

Since you don't own a V-8 S550, I'll give you some real world example(s).

I didn't lose any MPG due to the tune. Going from 3.31 gears to 3.73 I took a .5 mpg hit. Big deal, and NOT tune related.

My car was tuned since it had about a 1000 miles.
Limiter was raised from 6500 to 7800.
Reliability is the same now, as it was then.

Dollars to donuts my car would pass a emissions test, but since I deleted the cats, hard to test. I also gained about 1.5 MPG & 25HP with the cat delete. So now I make better MPG than the EPA's published DATA.

Hello; Glad you are pleased. No real point in us discussing further.

 

[GL95]

Hello; Glad you are pleased. No real point in us discussing further.

Its more like we're all talking to a wall rather than a discussion

 

[sk47]

Its more like we're all talking to a wall rather than a discussion

Hello; I have been trying to have a discussion. You and WildHorse have taken offense. guess you have a reason. So be it.

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