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How accurate is the MPG meter?

Benzadmiral

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2016 Buick LaCrosse 3.6 Premium
On my late '03 Park Avenue, there was an MPG meter, and you could read the gallons used as well. I found almost invariably that the former was 10% too high and the latter 10% too low: an MPG readout of 22 meant actually 20, and so on. I paid cash for gas then, so I would mentally add 10% to the gallons used display figure, multiply x $3.00 (the price then), and hand the clerk about $5 more than that, just in case. Worked out fine.

After a 25-mile round trip at freeway speeds last night, the LaCrosse's MPG meter is saying I have 23. Have you found your meter to correspond reasonably to the answer when you fill up and calculate (miles since last fill-up / gallons needed to hit "full")? If not, high, or low, and is it pretty consistent?
 

MelsRegal

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Regal GS 2017
You do realize a 16 year old gas sender may no longer be accurate? There is a known issue on certain cars that additives in the gas can effect the sender. One method to lessen the chance of that is to periodically add a bottle of Techron 2, black bottle.
 

Benzadmiral

Full Member
710
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Buick Ownership
2016 Buick LaCrosse 3.6 Premium
You do realize a 16 year old gas sender may no longer be accurate? There is a known issue on certain cars that additives in the gas can effect the sender. One method to lessen the chance of that is to periodically add a bottle of Techron 2, black bottle.
The Park Avenue story was just for background. I don't have that car any more. I owned it from 2007 to 2014, and right from the start (age four) it reported as I described above. And a dose of Techron was a regular part of my prep for an oil change.
 
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