To higher octane or not ?

[SFB]

Hybrid engine has different timing and resulting compression than eb. Therefore lower octane can be used.

I use 91 in my 19 Ranger but I have also used 87 with zero ill effects. For D.I. forced induction 91 is generally recommended and years ago you would have to. Years ago engines wouldn't run 10:1 compression with forced induction because of issues with knock or preignition. Todays forced induction engines run high compression with forced induction, they can do this now because of VVT and computerization. What a world

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[Jman79]

"Top Tier", what do you consider Sheetz and Wawa?

I get the shady run down gas station that has the same gas in the tank for 3 years. But are there any studies that show shell is really keeping cars around longer?

I fill up where ever is convenient, generally with what ever is cheapest. I run fuels system cleaner once or twice a year depending on mileage. My current car is 20 years old and 178,000 miles. Engine still runs fine and never had to fix anything, just 100k service and normal maintenance. Honda V6.

Are these ecoboost engines that much more particular? Does the manual state 91 require? I don't actually have one yet

 

[Raymundo76]

I use 91 in my 19 Ranger but I have also used 87 with zero ill effects. For D.I. forced induction 91 is generally recommended and years ago you would have to. Years ago engines wouldn't run 10:1 compression with forced induction because of issues with knock or preignition. Todays forced induction engines run high compression with forced induction, they can do this now because of VVT and computerization. What a world

So why does Ford "highly recommend" 91 for the hybrid which has a compression ratio of 13 to 1? Although they do say the min is 87. Is this just a CMA statement; or is there something to it? I do not know; but would really like to !!

 

[AF Blue]

So why does Ford "highly recommend" 91 for the hybrid which has a compression ratio of 13 to 1? Although they do say the min is 87. Is this just a CMA statement; or is there something to it? I do not know; but would really like to !!

Link to owner's manual:
" Your vehicle operates on regular unleaded gasoline with a minimum pump (R+M)/2 octane rating of 87. "" For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. "

 

[SFB]

So why does Ford "highly recommend" 91 for the hybrid which has a compression ratio of 13 to 1? Although they do say the min is 87. Is this just a CMA statement; or is there something to it? I do not know; but would really like to !!

I really do not have a good answer! So always, CMA...LOL My only thought is it burns cleaner. However I am sure that is debatable too. I'll attach a link for you to read which might help. However!! It's a dot gov, so I put that out there to CMA
Hope you get a satisfactory answer....
Almost forgot the link! Sorry, I tend to be an idiot at times....https://fueleconomy.gov/feg/octane.shtml

 

[Raymundo76]

Link to owner's manual:
" Your vehicle operates on regular unleaded gasoline with a minimum pump (R+M)/2 octane rating of 87. "" For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended. "

Thanks. I am 77, this will likely be my last truck. So for best overall vehicle and engine performance I will spend an extra $.45 per gal (assuming I actually get a mav before the grim reaper comes). And of course I will buy top tier gas just as I do for my 2021 Mazda CX-5.

 

[Raymundo76]

I really do not have a good answer! So always, CMA...LOL My only thought is it burns cleaner. However I am sure that is debatable too. I'll attach a link for you to read which might help. However!! It's a dot gov, so I put that out there to CMA
Hope you get a satisfactory answer....
Almost forgot the link! Sorry, I tend to be an idiot at times....https://fueleconomy.gov/feg/octane.shtml

Thanks see reply to AF blue

 

[SFB]

So why does Ford "highly recommend" 91 for the hybrid which has a compression ratio of 13 to 1? Although they do say the min is 87. Is this just a CMA statement; or is there something to it? I do not know; but would really like to !!

Where did you get 13:1? Specs show 9.7:1 just under the Rangers 2.3 which is 10:1

 

[Raymundo76]

Where did you get 13:1? Specs show 9.7:1 just under the Rangers 2.3 which is 10:1

I googled it and that was the result

 

[TomD]

Other than cost and MPG are there any issues (benefits) gained by using 89 or 91 octane gas?

I read the input from a member about using premium. For the first tank of all but 88 electric miles I averaged 37.7 mpg.
Now comes my question. Somewhere in this blog someone wrote about a disparity between the avg mpg display vs actual.
While tracking the mileage the dash showed an average of 42.2 mpg vs my actual 37.7. Is the disparity normal? I have only bought 6 or 7 tanks of gas. The 3 possibly 4 tanks were right on the money. Now the mileage doesn’t match. Any suggestions? Can the gauge be calibrated?

 

[K5Blazer]

Does this mean I should stop running methanol?
It really scoots with that in the tank.
The tailpipe flames are pretty rad too.

 

[SFB]

I googled it and that was the result

Intersting

 

[Raymundo76]

I read the input from a member about using premium. For the first tank of all but 88 electric miles I averaged 37.7 mpg.
Now comes my question. Somewhere in this blog someone wrote about a disparity between the avg mpg display vs actual.
While tracking the mileage the dash showed an average of 42.2 mpg vs my actual 37.7. Is the disparity normal? I have only bought 6 or 7 tanks of gas. The 3 possibly 4 tanks were right on the money. Now the mileage doesn’t match. Any suggestions? Can the gauge be calibrated?

I have never owned a vehicle where the "computer" mpg was right on. Can't say for the Mav (as I have been waiting for about 11.5 months). On my CX-5 it is always high by 2 or 3 MPG.

 

[Sykotyk]

I read the input from a member about using premium. For the first tank of all but 88 electric miles I averaged 37.7 mpg.
Now comes my question. Somewhere in this blog someone wrote about a disparity between the avg mpg display vs actual.
While tracking the mileage the dash showed an average of 42.2 mpg vs my actual 37.7. Is the disparity normal? I have only bought 6 or 7 tanks of gas. The 3 possibly 4 tanks were right on the money. Now the mileage doesn’t match. Any suggestions? Can the gauge be calibrated?

That seems a little excessive for the variation.

Usually mine averages about 41-47 depending on whether I'm doing a lot more highway driving on a tank . And my fill up is fairly consistently 1 to up to 2 mpg off. With this truck, they tell you not to top off, and sometimes a few stations near me will trigger very early. Sometimes a whole gallon before it's full. So when I know it's way off, I will top it off slowly to get close to where I think the MPG should be.

But a few times, the MPG is spot on or a fraction of a MPG better than the display. I chock that up to the truck not being completely full. I check this by what the next tank shows. If it's 2 (or more) MPG off, then I figure the previous tank didn't top off all the way.

I have not kept track of all fuel purchases to know lifetime average differences. But, on a tank to tank basis, it seems 1-2 is the usual norm to expect. And that's over 27k miles in just under 2 years so far.

 

[haycraftzack622]

Not talking about $; will the engine run better with a higher octane? Will long term maintenance issues be reduced. Or are there no real benefits other than a small gain in HP?

You can get a tad bit better mpg but it mostly gives you the lost boost psi back for the ecoboost

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