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Tank Capacity

Hashbrownn

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around 240-250 to empty is what I normally see with in-town driving
I have seen it go up into 300+ during road trips that lasts few days.
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NoVaGT

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I have a 2015 Gt Premium and I have been noticing a decline in miles till empty. I use to have after a fill up 315 miles till empty. Now recently I ve been getting 289 and the last fil up read 270 mile till empty. What is causing this?
Are you serious with this question?

You're using your gas faster, getting less and less MPGs. Why? Only you can tell us, it's how you're driving the car. And why did you mention tank capacity?
 

cbrookre

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Think we have found the problem!

My guess is that your average MPG has been on the decline as well. The computer will average based on some formula using your lifetime and recent mileage. If you want a root cause as to why this keeps declining, I think I have found the problem:
download.webp
 

VinnAY

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Are you serious with this question?

You're using your gas faster, getting less and less MPGs. Why? Only you can tell us, it's how you're driving the car. And why did you mention tank capacity?
Thank you :headbang:
 

Ilovemyv8

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All these comments make me feel better. My miles to empty on fill up is usually 376. Mostly hwy driving.
 

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Jdrid

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As others have said the computer keeps tracking of MPGs for Distance to E calculations separate from just the trip MPG. If you want to reset it you can disconnect the battery. Last time I had to disconnect the battery my DTE went to 350 when I filled up the next time, I had quite the good laugh.
 
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blakedanatural

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Thank you guys for all the input. I was thinking my pony was going crazy. lol! I am going to stay with Shell and stop filling up at any gas station.
 

qtrracer

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All summer I was getting between 23.5 and 24 MPGs on my 82 mile round trip, mixed commute (showing 360+ to empty). Lately, with the cold and perhaps switch to winter gas, mileage has dropped 1 MPG average to 22.5 to 23 - same commute. Does run richer, longer in open-loop. 8K on the odo.
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