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post #1 of 14 (permalink) Old 07-15-2016, 12:09 AM Thread Starter
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First MPG calculation

2016 Touring manual transmission purchased July/9/2016 @ Clear Lake Mazda

July/14/2016 North Houston to Dallas and back for work event cruising at 75Mph, (About 2600RPM) when not stuck in the Dallas mix-master traffic both ways! Boy that traffic sucks when the temperature is pushing 105 degrees!

Air temperatures going up; 83-88 and humid 6:05AM - 9:25AM; returning temperatures were 105-98 4:30PM - 7:55PM. No stops either way.

Filled up with 89 octane Valero @ $2.19 just before getting on the freeway and refilled about 4 miles from my house @ 7:55PM.

Computer display indicated 35.8MPG

Ending mileage - starting mileage / gallons filled = Calculated MPG
639 - 194 = 445 / 12.28 = 36.23MPG calculated

Nice, I think I'm going to like this car as it's fun to drive, has great steering, corners flat, is quieter than my 2007 Honda Accord V6 6-speed manual and just kills it on mileage. To my surprise the standard radio is pretty darn good.
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Last edited by BrianU; 07-15-2016 at 12:45 AM.
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post #2 of 14 (permalink) Old 07-15-2016, 09:33 AM
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Congrats on the new car. Yes, the Mazda's onboard fuel computer is one of the most accurate i have seen. There have been times when it was off by 2 mpg, but most times it is within 0.5 to 0.7 mpg of my manually calculated mpg.
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post #3 of 14 (permalink) Old 12-18-2016, 04:56 PM
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Here's what I found on the first fill-up on my 2017 GT:

The "Refill the Fuel Tank" warning came on with 30 miles remaining to empty according to the computer's calculation.
I refilled 10 miles later (ie. 20 miles "remaining") and put in 13.0 gallons. Gauge was indicating approx. 1/16 of the tank remaining at that point.
I calculated the MPG as 35.8; computer had it as 35.5

Assuming the usable tank capacity is 16.4 gal (per OM), and the fuel to fill when reaching 0 miles remaining is probably 13.6 gals, then this would mean about 2.8 gals are remaining in the tank upon reaching "0 miles remaining".

This seems to represent a fairly significant "safety" factor or reserve, nearly 100 miles!

Now that I know how large that "reserve" might be, I will try to run the next fill-up right down to the "0 remaining" mark or exactly "E" on the gauge. Stay-tuned!
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post #4 of 14 (permalink) Old 12-18-2016, 09:03 PM
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I have run it down to "0" many times but have yet to stick a couple of gallons in a can in the back and run it until it QUITS, thereby figuring out exactly how much is in there when it says "zero".

Capacity is not the same as usable capacity. I've gotten 13.5 gallons in on a refill when I ran it to zero, and over 13 several times. I'm not sure I buy there's another 2.5+ usable gallons in there..... that's quite a lot.

With the vent blocker removed from my Jetta diesel I've gotten within a half-gallon of published capacity and did not run out, but the pucker factor on that was quite high, as it was unintentional -- and running out in a diesel, with no tools to bleed the injectors, is a BAD thing.

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post #5 of 14 (permalink) Old 12-18-2016, 09:20 PM
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This is what I've calculated so far.

1/4 tank = 6 gallons left
Light turning on = 4 gallons left
1/8 tank = 3 gallons.. Typically where I fill up 3x a week.

Most I've ever filled up was 14.1 or 14.3 gallons and it was pegged at empty for a few miles. I ran it @ 0 miles to empty for 20+ miles. Pucker factor... 10/10.

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post #6 of 14 (permalink) Old 12-18-2016, 10:04 PM
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Generally speaking, you don't want to run your car completely out of fuel. In vehicles with an in-tank pump, the fuel pump uses gasoline as a coolant. By running the tank "dry", you run the risk of shortening the life of or burning up the pump.

@tickerguy is right about usable fuel vs tank capacity. The tank capacity is always greater because the fuel pickup can't reach all the fuel, so some is always going to be left over in the tank even if the engine stops because of fuel starvation.

When the fuel gauge reads zero in most cars, there's about 1 - 1.5 gallons of usable fuel remaining as a designed safety margin for people like @toy4x :P
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post #7 of 14 (permalink) Old 12-18-2016, 10:19 PM
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Quote:
Originally Posted by rjhornsby View Post
Generally speaking, you don't want to run your car completely out of fuel. In vehicles with an in-tank pump, the fuel pump uses gasoline as a coolant. By running the tank "dry", you run the risk of shortening the life of or burning up the pump.

@tickerguy is right about usable fuel vs tank capacity. The tank capacity is always greater because the fuel pickup can't reach all the fuel, so some is always going to be left over in the tank even if the engine stops because of fuel starvation.

When the fuel gauge reads zero in most cars, there's about 1 - 1.5 gallons of usable fuel remaining as a designed safety margin for people like @toy4x :P
What can I say.. I like to push it to the limit!

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post #8 of 14 (permalink) Old 12-19-2016, 11:38 AM
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Yeah there's definitely risk in running completely out and yes, there's an in-tank pump on the Mazdas. But there's also a door under the back seat to get to it, so you don't have to drop the tank to change it if it pukes :-)

Now on my Suburban there is no door, and those trucks are known for burning up fuel pumps too... fortunately mine has not yet failed...
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post #9 of 14 (permalink) Old 12-25-2016, 05:35 PM
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Here's what I found on the second fill-up on my 2017 GT:

The "Refill the Fuel Tank" warning came on with 35 miles remaining to empty (was 30 miles remaining last time).
I refilled at 4 miles "remaining" and put in 13.62 gallons. Gauge was indicating just a hair above "E" at that point.
I calculated the MPG as 33.7; computer had it as 34.3 Last fill the agreement was within 0.3

Assuming the usable tank capacity is 16.4 gal (per OM), then this would mean about 2.7 gals are remaining in the tank upon reaching "0 miles remaining". A pretty decent "safety factor" but not something I plan on pushing.

Fairly pleased with MPG thusfar. This tank had over an hour of idling when I neglected to turn the car off when I ran into the firehouse to grab my "other" ride. Plus 250 miles at 70-75 on I-95. I suspect the latter had the greater negative effect on mileage!
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post #10 of 14 (permalink) Old 12-25-2016, 10:39 PM Thread Starter
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Quote:
Originally Posted by kmielen View Post
Here's what I found on the second fill-up on my 2017 GT:

This tank had over an hour of idling when I neglected to turn the car off when I ran into the firehouse to grab my "other" ride. Plus 250 miles at 70-75 on I-95. I suspect the latter had the greater negative effect on mileage!
Assuming your other ride is big and RED, thanks for your service and Merry Christmas! Overall I remain pretty impressed with my Mazda6 though the Seventh Generation Honda Accord (2003-2007) K24 (4-cylinder) 5-speed manual was a benchmark drivetrain in a midsize car that would still hold it's own today.

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