Quote:
Originally Posted by TrailDust
tanyaisntarobot, what follows is taken from a post I placed in another forum regarding this subject. Take it at face value....
Just an additional note regarding super unleaded as many people freak out about that. I've made full tank comparisons between regular and super unleaded in every vehicle I've driven over the last thirty years and I've always seen the same result: regular unleaded yields poorer mileage but is cheaper, while super yields higher mileage but is more expensive. In the end, cost per miles driven is virtually identical. Why do I use super then? Two reasons. First, I hate filling up so when using super my improved mileage can keep me on the road (depending on the vehicle) an extra day or two before filling up. Second, I have a relative and a best friend who work as chemical engineers at major refineries who state that although detergents are added to all grades of gas, super grades offer the most benefits.
TrailDust
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+1 on this.
I will say that I've put premium in my little 4 banger before, and based on several 0-60 tests using both regular (87) and premium (91-92) I have concluded that using premium nets me exactly 0.00 RWHP.
My gas milage may increase by a tiny bit, we'll see for sure after I burn off the rest of this tank. Almost everygas station where I live, the price difference between lowest grade and highest grade is 20 or 21 cents. I usually buy about 15 gallons at a time, so that winds up costing me $3 more per tank, which for me averages out to about a whopping 8 bucks per month. Will I get good enough improvements in gas milage to more than cover it? Probably not. Is my truck suddently more powerful? No. IMO, on engines that are designed to run on 87 it really just doesn't matter, do whatever floats your boat. If your car is supposed to have premium, that's a different story.
