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Old 12-11-2018, 04:24 AM   #1
Borgi
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ACDelco 41-110 Iridium in 2000 Tahoe 5.3L

I switched out the stock plugs during a tune up in June 2018 with AC Delco 41-110 Iridium plugs https://mechanicfaq.com/spark-plugs-for-5-3-silverado/ per the AC Delco book and Rock Auto lookup. Since the tune up, I've always felt the gas mileage has come down. I'm getting 14-15 MPG on the highway keeping it under 70 MPH, when I used to get around 17 MPG. I chalked it up to ethanol fuels.

I just read that AC Delco is no longer recommending this plug for 2000 - 2005 5.3L vortex engines. They are now recommending 41-962 Platinum plugs.

Does anyone have details on why they made the switch? I'm curious to know if the 41-962's are more efficient for this engine and if I should make the switch to the latest recommendation. The $50 cost will quickly be returned if I get 3 MPG back.

Is anyone else running the Delco 41-110 plugs in a 2000 to 2005 5.3L and noticing a drop in fuel mileage?

Thanks.
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Old 12-11-2018, 07:26 AM   #2
travelin texans
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You can definitely account for about a 10% drop in mileage due to ethanol blended fuels. As for spark plugs I can't help, I've had a diesel since '05 & haven't found the spark plugs yet. LOL!
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Old 12-11-2018, 09:42 AM   #3
Howie
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travelin texans, keep looking for those spark plugs and you might become famous for being the first person in recent history to find them on a diesel
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Old 12-11-2018, 12:15 PM   #4
hankpage
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I have always found it easier in life to blame most problems on alcohol.
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