Im getting around 11.5 in my Tahoe and i have exhaust, air filter stuff like that and it won't go up im not ******* the engine and i regularly use injector cleaners, fuel system cleaners and it still stays at 11.5 any tips?
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How many miles?
Plugs, wires in good shape?
What type of driving do you do?
141,560 shop put new ignition wires in when they were doing the body module work because they accidentally broke them. mainly city
When were the plugs changed last?
The recommended service interval on plugs is 100,000 miles.
Air filter clean?
Tires inflated to proper pressure?
O2 sensors good I assume.
That would surprise me we go to one shop always uses high quality Acdelco parts.I would pull at least 1 or 2 plugs and check to see what type they are and what they look like.
Someone could have put cheap (non platinum/ non iridium) plugs in to save a few bucks amd they will not last nearly as long.
the only one that i've seen is redline that worked, ill get on amazon a little later and check it out.Have you tried Royal Purple Max Clean. It's the only injector cleaner that I've used that was worth a crap. It's got some awesome reviews
So what does your shop think about your fuel economy???That would surprise me we go to one shop always uses high quality Acdelco parts.