Gas mileage - Buick Cascada Forums
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Old 05-29-2018, 04:17 PM   #1 (permalink)
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Default Gas mileage

2017 Cascada, using 87 Octane, got 30.0 MPG doing a steady 72 mph on the cruise control for 250 plus miles. (Top up, and no significant wind)

Next tank , ran 93 octane, and the mpg only improved to 32.1 (all other conditions the same).

IMHO, the extra 20% or so that 93 octane cost, was not worth it to just get a 7% improvement in mpg. (The owners manual, although recommending 93 octane, does state that 87 can be used, but expect lower mpg and performance.)


How about others out there?
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Old 06-01-2018, 07:13 PM   #2 (permalink)
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I keep strict records on the amount of gas I purchase and the milage I receive. When I first purchased the car I tried three tanks of regular, three tanks of mid-grade and three tanks of premium. The mileage between the three was within 1 MPG of each other doing all city driving (my son says I drive like an old man. I tell him that's because I am an old man). I then used regular until I talked to a retired GM mechanic. He says that the reason that premium is the suggested fuel grade is so the fuel injectors do no get gummed up. Now I run three tanks of premium every once in a while (about every quarter) and regular the rest of time. I do not notice any difference.

Your results may vary.
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Old 06-03-2018, 08:09 AM   #3 (permalink)
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Good info. I wonder what the Euro drivers have available and what they use.?

I guess time will tell about the fuel injectors...

Loachdvr
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Old 06-12-2018, 08:24 AM   #4 (permalink)
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my diesel can get up to 54mpg cruising at 72mph. and max. 600 mile range a tank doing motorway mileage.
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