What MPG are you getting - Page 2 - Alfa Romeo Stelvio Forum
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post #11 of 34 (permalink) Old 12-08-2017, 11:34 AM
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Might also be worth it for people to post what grade of gasoline they're using too. I assume 93 octane or higher?
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post #12 of 34 (permalink) Old 12-08-2017, 12:51 PM
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Might also be worth it for people to post what grade of gasoline they're using too. I assume 93 octane or higher?
And whether it's Imperial or US Gallons please?
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post #13 of 34 (permalink) Old 12-09-2017, 10:55 AM
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Agree with the 22 mpg when switching modes and using paddles; however, I have reached 27 - 28 in "A" mode on the freeway for two hours.
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post #14 of 34 (permalink) Old 12-09-2017, 12:16 PM
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post #15 of 34 (permalink) Old 12-18-2017, 08:45 PM
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You guys have 93 octane? Nice!! Stupid California with only 91
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post #16 of 34 (permalink) Old 12-19-2017, 07:46 AM
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Still in the 'honeymoon' phase, I will splurge for 93 octane (even though I've been alternating 89 and 91 in the wife's A4 for years. Compared to my previous Jeep with 5.7 V8, we figure we'll save $100-200/month in fuel alone and mte shows 467 when the tank is full + I am very aware of NOT needing to fill it up, small but significant life improvement, especially during the winter months.

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Last edited by Scalewoodman; 12-19-2017 at 07:50 AM. Reason: Add whine about premium price for 93
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post #17 of 34 (permalink) Old 12-19-2017, 03:10 PM
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You guys have 93 octane? Nice!! Stupid California with only 91
Stupid Connecticut, my choices are 87, 89 or 93. haven't seen a pump with the less expensive 91 in a while

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post #18 of 34 (permalink) Old 12-20-2017, 11:39 AM
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Hi Guys ,

right now in Montreal we are seeing Gas prices at 1.28$ - 1.36$ Per liter... seeing that the Stelvio takes premium gas.. can we get away with regular octane ? or possibly 89 ?
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post #19 of 34 (permalink) Old 12-20-2017, 04:50 PM
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Hi Guys ,

right now in Montreal we are seeing Gas prices at 1.28$ - 1.36$ Per liter... seeing that the Stelvio takes premium gas.. can we get away with regular octane ? or possibly 89 ?
in most cars the result is the computer retards ignition timing to prevent knock, and you reduce HP and fuel efficiency as a result. Some cars (Audi in particular) are unable to compensate for the lower octane fuel enough and suffer significant knock problems, which will prematurely wear out engine components (primarily the pistons, connecting rods, bearings, and cam shaft), or in some cases cause catastrophic engine failure.

There's a good youtube channel called EngineeringExplained, he recently covered some information pertaining to this. summary is that for normal driving most cars that don't suffer from knock problems are "better" with 87 octane because the % of power increase is less than the % additional fuel cost, but only as long as the engine can compensate for the low octane fuel. However some tested vehicles saw as much as a 5-10% increase in horsepower & torque from the better fuel under load.

I suspect (but haven't tested) the high compression + 22PSI of max boost in our cars will result in significant knock problems. I did the calculations based upon the published displacement, bore and stroke numbers and got a 17.38:1 compression ratio, which is bordering on insanity if that's correct, and tells me that running anything lower than 91 octane will probably result in bad knock.

FWIW, the official requirement is Premium unleaded, 91 octane (R+M)/2

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post #20 of 34 (permalink) Old 12-20-2017, 05:04 PM
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The UK brochure quotes the compression ratio as 10:1.
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