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I am using 91 Octane in my MT 2016 Sport. I like the noticeable increase in responsiveness. I usually only use 911 octane on hot days, but now I'll be using 91 as long as it is cheaper than usual
 

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I am going on a trip next week will let you know what i see when it's all highway. One thing I have noticed i that the first quarter of a tank goes alot slower than the last thee quarters. that just might be the gauge. I also have been doing alot of "spirted driving and stop and go in the city so can't get an accuarte gauge on mpg yet I think it's about 25mpg with the way i'm driving I'm getting close to 500 miles now had it two weeks
Many tanks are like this.....they are wider at the top and narrow the lower in the tank
 

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I am using 91 Octane in my MT 2016 Sport. I like the noticeable increase in responsiveness. I usually only use 911 octane on hot days, but now I'll be using 91 as long as it is cheaper than usual
I am curious to try this as well. Especially as summer is coming up.
 

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I just bought a 2019 Grand Touring with 4100 miles on it. The last several tanks ive only been getting 14-15mpg. This is very odd and I don’t drive too fast. Also it should have a 16.4 gallon tank. When range goes to 0 and I fill up, the tank fills with only 13 gallons. Any idea what’s going on?
 

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If you drive in the city with a moderate foot those numbers are accurate.
There is a buffer built into the range.
0 miles does not mean an empty tank.
You have a few gallons left to use before dry.
 

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How are the current owner's doing, and what is your city/highway mix?

Gas mileage is one of the big selling points for me and I want to make sure it does as well as it says.
65,xxx miles on my 15 sport... according to the dashboard I've averaged 28.9 MPG, in all sorts of conditions
Mine likes highway speeds (don't they all?) set the cruise and I watch my range climb
Even at 80 MPH.... keep it steady....I fill the tank, and the range varies between 413-433 depending on how I had been driving (6 speed manual, give me a break... I'm gearing and steering)
Going across the state to my oldest daughter's house, my refill for the return trip shows 510-550 range
 
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