Not that I know of. The truck normaly runs fine. Every once in a while, there is pronounced rough idle at a traffic light. No idea if that could be a result of the 87 octane. But no pinging from too low octane.

I have also had to clean out the EGR tube twice (in 220K miles). Don't know if that could be related either.

The reason I mentioned it in my post is my suspicion that I get lower gas mileage on the lower octane fuel. It's my wife's daily driver and I have not remembered to actually prove (or disprove) this.

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Behind every great man is a great woman. Behind every great woman is a great behind.

I've heard a lot of people say that octane doesn't affect your mileage. I couldn't say whether it does or not. I've also heard it said often by people who know more than I do that higher octane than the manufacturer specifies doesn't benefit you in any way.

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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles

Nice flat roads in Texas helps gas mileage.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback

Before fuel filter retrofit: 15mpg
After: 19mpg

I have a 2002 ML 320 with 4 speed auto, the gas mileage has been very constant for over 120,000 miles between 15 & 16 mpg in town,19 mpg highway running 75 - 80 mph.