[Cinsue]

My dad asked me a few weeks ago how I knew the DIC mpg was correct and I thought that was a very good question. Yesterday I filled up and according to the Trax, my mpg for that tank of gas was 30. I wrote down my miles driven for that tank -- 335 and the gallons -- 11.865 and came up with 28 mpg.

I reset all my number every time I fill up.

Has anyone else checked their numbers?

 

[TrainTrax]

I am guessing that the ECU judges the distance you travel by what the speedometer says, and the speedometer isn't precisely accurate so you are bound to be off by just a few mpg.

 

[Cinsue]

That makes sense.

 

[cedarstrip]

You may have to average a few tanks of gas together .. if you fill your tank a little more or less this fill-up compared to the previous fill-up, it could add or subtract from your calculated mpg.

 

[TrainTrax]

I would also say that it is a better idea to average a few tanks of gasoline. Really its just for curiosity though, right? Are you really concerned about the fuel economy?

 

[Cinsue]

I am concerned about fuel economy, but I'm happy with what I've been getting according to the DIC. The curiosity comes from my Dad questioning if the information from the car is correct.

 

[James]

I am concerned about fuel economy, but I'm happy with what I've been getting according to the DIC. The curiosity comes from my Dad questioning if the information from the car is correct.

For the most part I think most owners will since a good portion of us come from cars that get mileage the Trax easily surpasses, with me that's the case.

 

[sdi]

My dad asked me a few weeks ago how I knew the DIC mpg was correct and I thought that was a very good question. Yesterday I filled up and according to the Trax, my mpg for that tank of gas was 30. I wrote down my miles driven for that tank -- 335 and the gallons -- 11.865 and came up with 28 mpg.

I reset all my number every time I fill up.

Has anyone else checked their numbers?

consider this: the tank was not real full last time, maybe a quart or two down... that would make the difference.
OR maybe the pump is not all that accurate and is not giving full measure.
play with the numbers... 12.0 gallons = 28.2
11.5 = 29.1
11.0 = 30.5
Keep a record over 4 or 5 fill ups, you will probably find the computer is spot on.

 

[SeattleTrax]

I too wondered about the dashboard MPG indicator. I have run about 5 tanks of gas using the traditional measurement technique applied consistently using the same pump at the same gas station and have found the MPG indicator to read optimistically by about 1-2 MPG. As long as it is consistently off by a known amount then one can reckon the correct/actual MPG using the DIC.

 

[sdi]

I too wondered about the dashboard MPG indicator. I have run about 5 tanks of gas using the traditional measurement technique applied consistently using the same pump at the same gas station and have found the MPG indicator to read optimistically by about 1-2 MPG. As long as it is consistently off by a known amount then one can reckon the correct/actual MPG using the DIC.

US MPG is about 20% of Imperial MPG.
check your settings, it could be set to Imperial Gallons and that would set you off (shows better than true)

 

[beeguz]

I just checked out the gas mileages on my 16 Miata, the Estimate on the IP said 40.3, figuring out with a calculator I got the same exact mileage.

One tank of gas for 29 days of use.

 

[default-user]

I am guessing that the ECU judges the distance you travel by what the speedometer says.

uhhh.... the speedometer doesn't track the distance traveled, it only tells you how fast you go.

 

[Jobu]

I have a strange one. I shortened my tires and figured the mileage would drop and instead doing the same routes mileage has gone up combined from 7.4l per 100km to 7.2 per. 31.8mpusg to 32.7mp usg combined (manual transmission)

 

[beeguz]

I think what happened is the smaller tires make more revs per mile, looking like you went further than you actually did.

 

[Jobu]

I think what happened is the smaller tires make more revs per mile, looking like you went further than you actually did.

Makes sense. Thanks

 

[Jobu]

I think what happened is the smaller tires make more revs per mile, looking like you went further than you actually did.

Makes sense. Thanks

 

[5457]

When I calculate the mpg on my Toyota I have to add 10% to the miles driven because the 10% error on the speedo/odometer is due to oversize tires. I've been tracking the mpg on the Trax since day one and it's ranged from 20.01 mpg around town to 29.25 mpg hwy while the indicator always shows a few more than that.

 

[Beech Creek Gary]

Hi all, first post
I bought a 2017 LT AWD about 10 days ago & so far the DIC only overstates the mileage by 1 or less mpg. I think if you pump at a moderate speed and do the 3 click thing it'll go a long way in getting consistant fill ups.

 

[beeguz]

Most of the winter when I would get to the point where I normally fuel up my DIC would say 25-27 MPG, now that it has warmed up I'm getting 30 to 35.

When I had my Trax I saw as high as 39 in warmer weather.

Since I bought my cars last year, I have been using 93 octane I like the quick throttle response and the better mileage.

 

[Rlittle650]

1st tank computed mileage 26mpg. DIC said 25mpg.