[427sharpe]

A properly tuned motor with 10.5:1 shouldn't have a detonation problem with 93 octane pump gas. Octane Booster will be a mind game, nothing more. Remember that most octane boosters claim a 'point' increase. A point is 1/4 of an octane rating. So, 104+ Octane boost claims a large can will raise 10 gallons of gas 5 'points' (read the can). If you run a 10 gallon tank, a $7 can of 104+ has given your 93 octane pump gas an astounding rating of.....94.25. If your tank is 20 gallons, you end up with 93.625. If you are paying 1.50 for 93 octane and add the 104+, than you paid 2.20 for 10 gallons of 94.25 or $1.85 for 20 @ 93.625? I don't really think this is a good value. SAAC did a recent study on 'Race' gas versus pump and found NO DIFFERENCE in lap times or engine reliability. A worthy note...NASCAR runs a 93 octane blend from Unocal...and gets 750 HP from 358 cid! The answer lies in TUNING, not octane!