is this worth doing? seems same thing the stp product does while only costin few bucks compared to a dealership costing $120....Fuel Injection Service
View DetailsHide Details$11995* Cleans Injectors, removes deposits on intake valves & combustion chamber to help maintain maximum performance and fuel efficiency . Fuel system cleaner also added to fuel tank to ensure entire fuel system is cleaned

ok so its not a thing to do for preventive measures... was wondering if its a good thing to do now and then to keep things healthy and such..

well i bought her used with 40k on her and i dont know how she was driven or history of oil changes so i was wondering whats some good service jobs to have her get her physical

lol yea but how i know for sure she aint.. how i know for sure shes fireing all perfectly without even a little mishap..

so then i can trust the computer to do just that then? i didnt know if the computer would be that sensitive to noticed any little hick up... also the only 2 times i had filled her up since getting her both times computer stated like 266 mileage for the gas now useing 18 miles per gallon with 18 gallons gives me 324 for a full tank which i would see displayed on my 07 i had this one doesnt seem to be reading correctly and on my last full tank even saying about 266 for tank and with the low gas notice which comes around 44 miles left in tank i did get little over 300 for the tank of gas but i figured after full tank worth of driving and then getting this full tank i woulda seen 300 plus miles when i got the full tank...just wondering if maybe still recalulating new owner style of driving.. also how i know for sure the tire pressure sensor is giving me right reading i filled the tires up 2 times now since they where little under 32psi and at fast trac they have a pump that u can put in what ever number u want and then pump up and the machine will stop when ur at the number u pushed but seems the machine 32 will show 31 on my car computer granted maybe i should trust my car computer than a pump at gas station but u thinking when i get oil change at dealership make sure they check my tire pressure than compare to dashboard.. also i saw at a jewelery store temperture sign saying X degrees while my car said something like 4 or 5 degrees different again granted who knows how that store reads the outside temp compared to my car but just wondering if the car's computer would ever give false readings would my check engine light service light come on and therefore indeed the computer is whacked?

Ok,now your comparing apples to oranges. The computer for the Driver Info center is not the same as the one that runs the motor. The distance of Mileage till empty will vary depending on what that computer sees for average fuel mileage. Next time you fill up, reset the average fuel mileage and the fuel used entries. The distance till empty will change but won't be really accurate until you drive for a few miles. And by accurate, GM means +/- 4 MPG.

And the outside temp gauge sensor is mounted just before the radiator. it does pick up some radiant heat from the radiator when sitting and will get a wind chill effect when driving. Compare that to one on a bank or store sign that is a stable sensor, the readings will be slightly off.

Yes, the PCM will pick up any little hick up, but it won't set a code until it sees the issue more than twice between 2 conscutive drive cycles. Unless it is a drastic enough issue that will cause damage to the catalytic convertor, then it will set the code instantly and turn the light on. As for False readings, if it happens once it will set a pending code but not turn the light on, if it doesn't happen again within the next 3 ignition cycles, it will assume that it was just a glitch and delete the pending code. If it does happen, then it will set a code. And there is a code for internal PCM failure, so if it runs the self diagnostic and there is something odd in the computer itself, it will turn the light on.

Tire monitors are in yet another Module. Each TPM sensor in the wheel is calibrated to that module in a zero pressure state from the factory. Gas station gauges, those cheap push in style, even the $5.99 digital gauges are not as accurate. The gauge I use at work is 3 psi off from GM sensors. Best thing to do is buy a decent gauge and compare it to the TPM readings on the dash when it reads the correct psi and compare the 2. Just use the same gauge from now on.

city driving and hiway driving will give you different MPG, and it may take a bit longer to correct itself because your not driving the same distance as before.

Plus remember this, Were on Winter blend gas untill the middle of this month, so the added ethynol and other additives will cause your MPG to drop about 5-10%.

Can't go by the computer for actual, Got to work it out by physical amount of miles divided by actual gallons.