^ Yes, There should be a compression bump or a F/I Tuning in order to burn 93 more effectively by the time your done you are better off with Race Gas..
91 is all you need with a stock or bolted-on MDX, if that isn´t available then 93 but you wont get any benefit from using it if you have the option of 91 vs 93.
Costco gas actually uses more detergents than most gas stations out there in their additive packs! Plus with high turnover there is a lower chance for water in fuel.
FYI 94 +octane booster showed improvement 4hp to wheels on my STOCK MDX. Dyno was done some day, two hours apart, few runs..... So yes, higher is better, especially if it is hot outside or you are doing some towing, or driving in or driving in hilly areas...
In Chicago area Shell is da best and really not a fan of Costco gas. And I have to agree with Supertech... Costco is worst fuel I have tried. Last Place I would go is Costco to get my fuel for my MDX. If i would have Dodge Neon, yeah right, no problem, but not for my Acura
snake oil seafoam is nothing but napthaThe only additive I use is a can of Seafoam every 6 months (Oil and Gas) or 1 Year in my Cars but I haven't done this in the MDX.
I did that on my TL-S + Syn Oil and well you will never guess this valvetrain has 215K on it:
On the other hand, opposite to your scenario, in a cold climate, perhaps higher octane is harder to ignite and can cause incomplete combustion resulting in slightly less power and carbon build up?Costco gas actually uses more detergents than most gas stations out there in their additive packs! Plus with high turnover there is a lower chance for water in fuel.
Technically, using a higher octane CAN provide more power but in very limited circumstances. For example, its a 110 degree day and you've been driving for an hour or so. The engine is HEATSOAKED to where the ECU is cutting back on timing due to detonation with 91 octane. You fill up with 93 or 94 octane and MIGHT have a little bit more power as 93/94 is slightly more resistant to detonation than 91. This means the ECU can advance timing and allow for a more air which means a larger boom for more power. With that said, you might get as much as 5HP switching from 91 to 93/94. Remember that's about a 1% improvement if that with 300HP.
It does come with diminishing returns as the engine is only programmed to allow enough air for a car with 91 octane running at optimal conditions (no retard of timing).
I rather have proof than words, This video shows the before and after internally:snake oil seafoam is nothing but naptha
Not quite! The spark plugs are designed to provide enough energy to burn most of the fuel injected! In winter time, gas stations switch blends of gas causing fluctionations in MPG. In winter, ethanol in gasoline will hold onto more water making the "octane" higher, but the energy per gallon of fuel will be less.On the other hand, opposite to your scenario, in a cold climate, perhaps higher octane is harder to ignite and can cause incomplete combustion resulting in slightly less power and carbon build up?