87 Octane plus Octane booster?

I think it would be difficult to know if you actually achieve 93 with the octane booster.

Does it actually pay? How much more is a tank of premium vs. a tank of regular & how much does the booster cost?

Around here (Dallas), the difference is about 30 cents per gallon, so with the 20 gallon tank on my '02 Pathfinder, we're only talking about a difference of $6.00 if the tank was completely dry (which it never is).

By the way -- there's a guy who calls himself "common_sense" who will shortly start screaming at you for this post. He apparently believes that a drop of anything other than premium in a Nissan will cause the world to abruptly end.

I have a 2006 Frontier with the 4.0L V-6. My Owner's Guide allows for the use of regular grade gasoline, but also says for maximum power and fuel economy premium should be used. I've had other vehicles in the past that made the same sort of claim, but had never been able to detect any imporvement when using premium. However, with gas over $3.00 a gallon, and premium only around $0.20 per gallon more, I thought I would take a chance on running premium. After I made the switch, I saw an immeadiate and consistent 3% to 5% imporvement in fuel economy (I keep detailed records). I ran premium for a couple of months (over 5K miles) and the improvement was consistent. With gas hovering near $3, this amount of improvement was very close to justifying (on economic grounds) the use of premium fuel. To verify my resutls, I switched back to regular. Guess what, the fuel mileage did not return to the "pre-premium" average. In fact, it was just as good as with the premium. I don't buy one particularl brand of fuel, but I do buy from the same group of stations (Shell, Citgo, Raceway, Hess, Exxon) and I drive almost exactly the same route every week, I am baffled. I am going to run regular gasoline for another couple of weeks and then switch back to premium to see if there is any change.

As for the use of Octane Booster, I can't imagine they are good enough to make up the gap in octane between regular and premium. See

Based on this article, I'd say the Octane Boostes were mostly a scam- if not potentially damaging to your car. I read the FAQs at a coupleof web sites run by the makers of these products. One flatly statedthat you needed to run the grade of gas recommended by the vehiclemanufacturer. STP's Octane Booster appears to not really boost octaneat all, rather they just claim it will clean deposits that might makethe engine require higher octane fuel. And, as usual, nobody outclaims the good folks at Amsoil. They boldly claim that their productcan raise the octane rating of 88 octance gas to 93 octane gas. 4%2B&IDc Ed