Gonna try a different plug/coil pack combo.... NGK Ruthenium HK
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Senior Member
Joined: 12-26-2015
Posts: 235
From: Central Florida
Mileage at Plug / Coil change = 101549 - current mileage = 101942 - still at zero indicated misfires since swap.
First refill since change 12.211 gallons 300 miles driven = 24.6 MPG but only includes a single hour+ trip ~132 miles with fuel up at ~80 mile mark, and more than an hour of idle time. Of course with the gas prices going up, I'll be avoiding any unnecessary trips, so MPG will be based on four 12 mile round trips a week for work + any shopping mom needs to have done.
Wow, that's a lot of mileage! How many HHR's?
Problem is: you could actually be a better mechanic than my retired mechanic (who's currently driving RV from Florida to Alaska), but I could never truly know that from just from online interactions.... I do know that most of the time, I see solid info from you and donbrew on here, so I do always take that into consideration!
First refill since change 12.211 gallons 300 miles driven = 24.6 MPG but only includes a single hour+ trip ~132 miles with fuel up at ~80 mile mark, and more than an hour of idle time. Of course with the gas prices going up, I'll be avoiding any unnecessary trips, so MPG will be based on four 12 mile round trips a week for work + any shopping mom needs to have done.
Drive on! I’ve been a mechanic since 1973 , been working on HHR’s since 2007. One thing I ve learned is , it’s your car do what you want when you want to!
Google or Facebook don’t work on cars just opinions.
I’ll take care of my HHRS as I have for a total of 843,000 miles.
Google or Facebook don’t work on cars just opinions.
I’ll take care of my HHRS as I have for a total of 843,000 miles.
Problem is: you could actually be a better mechanic than my retired mechanic (who's currently driving RV from Florida to Alaska), but I could never truly know that from just from online interactions.... I do know that most of the time, I see solid info from you and donbrew on here, so I do always take that into consideration!
Last edited by chaosdsm; Apr 3, 2026 at 12:25 PM. Reason: data correction
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Joined: 10-13-2011
Posts: 40,097
From: Welland,Ont Canada
Just 2 HHRS, my 2007 LS 2.2 L and my 2012 2 LT 2.4 L
I get your point about online information, but if you think about the old repair books like Chilton were written by guys like me, and Donbrew, you didn’t know who they were, but you trusted their knowledge
I get your point about online information, but if you think about the old repair books like Chilton were written by guys like me, and Donbrew, you didn’t know who they were, but you trusted their knowledge
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bigjacksauto
2.4L Performance Tech
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Feb 10, 2012 12:33 PM
