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The UK brochure quotes the compression ratio as 10:1.
I can't seem to find any official documentation for that number. I did find it on a couple 3rd party websites, but they also listed the engine as 190hp - 200hp, so I dismissed it as false, however 10:1 does sound far more believable, especially for a high boost turbo engine.

I used the calculator here:
https://www.summitracing.com/expertadviceandnews/calcsandtools/compression-calculator

and the official specs located here:
https://www.alfaromeousa.com/content/dam/alfausa/pdf/stelvio/2018_AR_Stelvio_Specifications.pdf

but now that I try to re-do the numbers I think I mis-entered something as I can't get anything meaningful to calculate again (it's saying 2:1 ratio now!), so I believe my conversion to the tools inputs was faulty.
 

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Running 25.1 in mixed driving using 93 octane this tank. Excellent. I am a pretty conservative driver but Temps are very Chilly at the moment. Fill ups are about half as many as my previous beloved Jeep.
 

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Don’t drive in “A” mode!!! This post is a bit tongue-in-cheek as we say. One of the Forum members said in passing the other day that MPG was not really something to be focused on. They said (and I apologize that I don’t recall who it was) they reminded themselves of Why they bought an Alfa. It is not to get world-class gas mileage. So, after driving around in “A” mode the past week, I switched back to “N” yesterday. What a difference it makes! I can feel the Joy again of driving this vehicle. I live in Minnesota where the roads can be covered with snow many months of the year. I do not recommend driving in “D” mode with snow or ice covered roads. At least I have not found it terribly easy to control the Stelvio when doing so. I will save “D” mode for Spring, Summer, and Fall driving. Enjoy your Alfa!!
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Don’t drive in “A” mode!!! This post is a bit tongue-in-cheek as we say. One of the Forum members said in passing the other day that MPG was not really something to be focused on. They said (and I apologize that I don’t recall who it was) they reminded themselves of Why they bought an Alfa. It is not to get world-class gas mileage. So, after driving around in “A” mode the past week, I switched back to “N” yesterday. What a difference it makes! I can feel the Joy again of driving this vehicle. I live in Minnesota where the roads can be covered with snow many months of the year. I do not recommend driving in “D” mode with snow or ice covered roads. At least I have not found it terribly easy to control the Stelvio when doing so. I will save “D” mode for Spring, Summer, and Fall driving. Enjoy your Alfa!!
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I turned it to A for a bit when cruising down the highway for an hour or so, didn't see any difference from N, so I went back to N. Soon as I got off the highway I went back to D/M, because of the snow and greater feel and control I felt I had. I like feeling the rear end get squirrelly when I give it a touch too much throttle, that's how you know how much grip you have. Just with our Q4 AWD as the backup you then have 2 more wheels to split the grip between as soon as you need it. Fun like a RWD, capable like an AWD.
 

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I averaged 26.5 mpg on my 699 mile drive home from the dealer (Costa Mesa, CA to Salt Lake City). That of course was mostly highway miles, but also included some non-highway miles at the beginning and during pitstops, etc. Being a new car I made an effort to vary driving speeds, but I did do some experimenting at different speeds to test the gas mileage.

For a 40 mile stretch of completely flat Nevada desert I set cruise control at 65 mph and got 34.2 mpg.

I set it at 80 during a 60 mile stretch of mostly flat road in Utah and got 25.2 mpg.

117 mostly flat miles at 75 mph came in at 30.3 mpg.
 

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About 6700 miles and averaging 25-27 MPG in mixed local driving; 28-30 highway depending on wind conditions. Prius drivers pass me all the time and give me the finger (not)!
 

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Now I know we didn't buy an Alfa for the gas mileage, but....this situation got me wondering.

I recently drove a Sport model loaner that hit 23+mpg for the 150 miles I drove it. I have a Ti Sport, and have been struggling to get 20mpg on every tank. Both have approximately 3500 miles of break-in, both running the same brand premium (92) gas, same commute roads and similar traffic, same driving style and mode (probably even a bit more aggressive on the loaner).

The service advisor thinks the difference in mileage is because I have the 20" rims and wider tires (255/45) vs the 19" on the loaner.

Is this possible? Anyone hitting the 22/23+ club with 20"?
 

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I have a TI sport and I just reached 23 mpg. I have approx 4100 miles and I havent reset the system. Was a bit lower (21-22) until around 3000 miles. I average 41 mph according to the display.
 

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Now I know we didn't buy an Alfa for the gas mileage, but....this situation got me wondering.

I recently drove a Sport model loaner that hit 23+mpg for the 150 miles I drove it. I have a Ti Sport, and have been struggling to get 20mpg on every tank. Both have approximately 3500 miles of break-in, both running the same brand premium (92) gas, same commute roads and similar traffic, same driving style and mode (probably even a bit more aggressive on the loaner).

The service advisor thinks the difference in mileage is because I have the 20" rims and wider tires (255/45) vs the 19" on the loaner.

Is this possible? Anyone hitting the 22/23+ club with 20"?
If I drive it within reason, I do and have 20”.
 

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I am averaging 24.7 MPG over a 28 month period, and I would estimate 80% of my driving is commuting. I tend to keep it in D, it's more fun. On the few road trips I have taken in my 2018 Stelvio Ti, I consistently get just over 30mpg if I use cruise and keep it in A. I only put it in N when I have it valet parked. I always use 93 octane --- Costco is the best price for this level and sell only premium rated fuels.
 

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Costco in MN is 92 octane (I'm not arguing, just pointing out the difference). "Premium" at most places
is 91. some BP, (but not all) carry 93.
 
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