2021 Mazda c/m-5 87 octane
#11
Understood about the higher octane giving the 250hp. I was asking about why Mazda recommends 91 octane for the turbos.
#12
Exactly. If the engine produces the best hp/tq figures with 91+ octane, this would be the recommended fuel, right?
#13
I have attached screenshots from the Owner's Manual. Just to be clear, this is a US CX-5 and it's Owner's Manual.
#15
But I can see that your comment about the distributor leads me to think....mmmmm.
The reason that MOSRT auto manufactures "REQUIRE" higher octane fuel is for the obvious reasons. But not to or to suggest that the use of higher octane only supports power is inaccurate. Higher octane levels with the average driver will help support a more consistent and, in some cases, higher MPG. And for the experience using the instant MPG monitor can improve MPG using higher octane fuels.
For the DISTRIBUTOR comment. First it was "KOOL"! but then you forgot to mention changing the Dwell, the counterweights, thee counterweight springs and possibly plugging the vacuum advance. Turning the distributor on an unmodified Distributor more cases caused more problems than cures without doing it correctly.
Last edited by Callisto; 12-23-2021 at 10:57 AM.
#17
Its a common sense assumption that this is done regarding the ECU/ECM/PCM on vehicles, so sort of but not always and not really so much with the MAZDA. Maybe read my previous response. Specifically, the Skyactiv ECU. I have been developing power parts for the 2.5 and have monitored what the ECU does. I did about a year ago run one complete tank of 87 octane Chevron and compared the results and data logging on which was close to the exact same miles and travel route. I can tell you everything was less, power and MPG. While I did Not DYNO the 87 because (WHY), (LOL) I have run several DYNO runs setting up and running the same DELTA each time from the base line completely stock MAZDA 2,5 to each addition I made on the engine or something that may affect the engine output?
#18
just to go back to your original comment on MPG's i can say for sure., my 09 lexus gx470...."recommends" 91 octane...and when I tracked my gas usage i clearly squeezed a few extra miles out of a gallon of gas when using the higher octane and thats not saying much...going from 14 to 17 mpg...at least it offsets the increase in the price of that gas.
#19
I am always chuckling when someone spends the amount on a new vehicle and then wants to stretch all the service schedules like oil, filters, spark plugs, etc., and then NOT to use and spend a little extra for a fuel that will achieve the best overall performance from the engine????? REALLY you all are just funny! Maybe it just to talk on a forum but I can tell you in the shop back lot we are now 2 weeks catching up on customers cars for service needs. And some of them are complaints about power and MPG. They all have that one common fact, use of low octane fuel and not changing the sparkplug's (usually the average is 40Kmiles) until a DTC P300-P308 is found in the OBDII.
ASE
ASE
#20
"Cheaping Out" (Painfully) and using 87 Octane Gas.
This is a non-turbo CX-5 correct? If so the only benefit to you paying for premium is to bump the petroleum companies bottom lines... I don't understand your logic of "cheaping out" buying 87 octane gas. If your car is designed for 87, there is no advantage to paying for higher grades.
"Cheaping Out"..... You kill me.
Best Regards, RMV