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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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