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Shell is a top tier gasoline, so their fuel is high quality in relation to how it keeps an engine clean. Maybe they keep going and say since the engine is cleaner it will run better/be more efficient because you use their fuel.
Whether a 1-3% decrease in fuel consumption outweighs a higher price depends on how efficient the car is and the price of gas.
Say you get 20mpg and low octane fuel costs $4.00
2% less fuel used would be 20.4 mpg
5% rise in fuel cost would be $4.20.
Originally it would cost you 20 cents per mile.
The "fuel saving gas" would get you 20.58 cents per mile.
Say you get 10mpg,
2% better would be 10.2 mpg
5% would again be $4.20
So originally it'd cost 40 cents per mile
"better" gas would cost 41.18 cents.
etc...
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