Overhead MPG after new spark plugs? - Hemi Truck Club
 
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Old 09-08-2012, 04:19 PM   #1
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I changed out my spark plugs at the 40K mark, going with the NGK's thanks to info from here and good service I've had with my Evo Springer. I'm curious, anyone else has had a significant drop in average MPG's from the overhead readout after changing plugs? I know it was not accurate, but I felt better getting told I was was getting 15-21 apposed the 12-18 it says now. A more accurate estimation if I'm REALLY nice to it.

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Old 09-08-2012, 04:19 PM   #2
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I changed out my spark plugs at the 40K mark, going with the NGK's thanks to info from here and good service I've had with my Evo Springer. I'm curious, anyone else has had a significant drop in average MPG's from the overhead readout after changing plugs? I know it was not accurate, but I felt better getting told I was was getting 15-21 apposed the 12-18 it says now. A more accurate estimation if I'm REALLY nice to it.
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Old 09-09-2012, 04:16 AM   #3
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Hello stranger. I've never noticed a drop after changing pugs. Can't imagine why that would happen.
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Old 09-09-2012, 04:44 AM   #4
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I pay no attention to the O/H console's mileage guess. The Ram got new plugs @86K and I'm sure the mileage improved The C got plugs at 49K. The mileage probably didn't change that much. You might try resetting the computer.
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Old 09-09-2012, 12:44 PM   #5
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What did you gap them at?
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Old 09-11-2012, 08:03 PM   #6
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I gapped the plugs at whatever the spec is for them per the radiator support sticker. Something like .044? Interestingly, I checked the gap on the old plugs and they were still in the same spec. I thought about swapping in oem replacements, but the cost and such isn't worth it. Might try it next time. Unfortunatly I don't know what the actual MPG is. We took my wifes truck up for the yearly visit to kin in Tulsa so I can't compare long trip milage. I get 400 miles to the tank on these trips. I belive that the milage has not changed for my typical day to day driving gettting between 275-300 miles per tank.
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Old 09-12-2012, 05:52 PM   #7
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I started tracking my mileage with Fuelly since I bought the new truck. It's pretty simple, just input mileage from the odometer, the number of gallons, and the price per gallon. It figures the mileage, and then tracks it all online for you. You can even put a cool little pic/link in your signature.
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Old 09-13-2012, 01:05 AM   #8
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i do the same...at least when i remember haha..took it out of my sig tho
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Old 09-14-2012, 04:42 AM   #9
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I need to start tracking mine...
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Old 09-15-2012, 01:06 AM   #10
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Seeing as that I only drive mine at the strip I need one that reads GPM...
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