Tower most gasolines come with detergent in them and are going to keep engine as clean as gas can. Higher grade will not neccesarily do any better job cleaning it has same detergent as low grade. Build up etc. is due primarily to rich air/fuel mix. Get a good injector cleaner additive and run it every 2 or 3 tanks. If you suspect a problem go to dealer or any reputable mechanic with the equipment and they have a machine they can hook up and flush combustion chamber to clear carbon. They use machine along with an additive that they flush through it. Stuff in tank helps get rid of impurities left in fuel lines.
I feel it is a myth to run high grade. besides I do not think one tank full would do that much good even if it did help.
Hummer techs can probably help more with this issue.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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