d_nim_lsB to Mechanic Advice@gearhead.townEnglish · 10 months ago

Poor MPG after 100k service

d_nim_lsB to Mechanic Advice@gearhead.townEnglish · 10 months ago

Looking to the Reddit gods for help here. I just did my 100k service on a 2011 Silverado 1500 (5.3 LT) - plugs, coolant flush, transmission fluid/filter, front suspension. Truck drives noticeably better all around, feels like butter accelerating and shifting. BUT. Prior MPG was 16 and now it’s down to 12. I did use NGK Platinum plugs and reused the wires. My only thought is to put ACDelco plugs and wires in but would that make sense?

Air filter is clean. Reputable shop did the trans fluid and alignment. Will clean the MAF shortly. Oil change 3k miles ago.

I’m on a 1500 mile road trip and it’s already not that fuel efficient lol, what would you do?

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10 months ago
Oh absolutely I agree. But when you do maintenance and the result is a 25% loss in fuel efficiency, there’s something awry. Driving habits have not changed.

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