If You will do a search for Octane You will find allot of info and one will be MY lecture on octane and what it means and why it can be different than what the pump says due to how long or how short of a time it has been in the tank at gas station. I have Buddy in the oil business and actually works with the octane quality etc. he is a chemical engineer with a major oil compnany.
Or You could look up My soapbox lecture and see what He told Me. But, Phil is correct in what He says about octane not helping MPG and that low octane is extremely violent burning that is why You have to go to higher octane to prevent detonation when you switch to forced induction.
Also if You should go to a high flow head as I'm doing later this year You should get one that will flow more air and not increase compresion. If You raise compression with forced induction You are looking for trouble unless you do the bottom end work along with the heads.
Stock rig should do just as well on 87 octane as any of the other and You save money.
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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