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Originally Posted by undrgnd
Give you an E for effort since you're mostly correct.
1. You mean highest gear possible, not lowest.
2. The effect of octane on fuel consumption is not that black and white: Unless you have objective proof, I respectfully disagree that higher octane yields better mileage.
3. The ScanGauge is not that accurate. Even the MFGR only claims 5%. Depending on how you drive, it will be off tank-to-tank. I have seen it be dead on, and I have seen be off by 1/2 gal out of 14.
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LOL yea highest gear, ill edit
I'm not saying higher octane gets better MPG, it gives you the right MPG in the Si. Lower octane in higher compression causes detonation which the computer has to retard the timing (i believe) which turns into less power = less MPG
Depands on the pump. Today i filled up, scangauge said i used 11.2 gallons i put in 11.3 gallons. If i flip flop gas stations i see up to .5 gallons off too at most but if i use the same pump its rarely over 0.2, mostly 0.1 off.