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Thanks. that was educational.I'll stay away from snake oil salesman. I am pretty sure that I will start from air filter, tire pressure, the basics. Also, I will keep put 93octan for while to see how much would change comparing between 87 and 93octane.

Thanks for post What is snake oil!?Is that additive for engine oil? So far, I decided to buy K and N filter, Fill tire air to 39psi, and I will think of buy programmer later on. I notice something about how much effect on gas mileage. Higher octane gas seems to have better MPG. my...

mmmm,get what you paid for....so didnt do much I assume. I guess Chevy would done it if that really works. I wanted check K $ N filter anyway, so I will check into filter or cold air intake first. Thanks for the tip.appreciated

I own 2007 Tahoe, I love my car,but gas mileage is not so good. I was looking around cold air intake, exhaust system,but I ran into some web site selling "performance chip" will gain upto 60HP and increase 4 to 7MPG in fuel economy. they says on there website, its connected to IAT sensor to...