[11WhiteEco]

So I went to the gas station last night to top my gas tank off. I had just under a 1/2 tank. On my DIC it showed that I had used 5.7 gallons since my last tank full. After filling the tank up it took 6.024 gallons to fill. I have the Eco which only has the "10 gallons tank" which we know is just the cutoff level and can be slowly filled to the same amount as the non Eco Cruze's. My question is, do you think the DIC is a more accurate estimate of the actual gallons used since we really don't know with the Eco gas tank if it cuts off at the same point each time.
Thanks

 

[Leo]

Without knowing for sure how the DIC know how gas you use, I assuming there is probably a measuring/metering unit that keeps count on usage. As for filling your gas tank doesn't matter wheter its a ECO tank or any gas tank on any car. When you fill your tank you don't know if your filling to the excat same point everytime. Think of a example of filling a 4 quart measuring cup with water. You put in a 2 quarts everytime. You know you have 2 quarts everytime by looking at by looking at the measuring lines on the cup. When you fill your gas tank and the gas noozle shuts off you think your tank is full, but you don't know for sure if full is to the bottom of the fill tube or the top of the fill tube. Thats probably why there is varience on the gallons you use You can not visualy see if your filling your tank to the same level every time like you would if you filling a measuring cup

 

[Vetterin]

I get gas every weekend for my "12.6 gal tank" Eco as I travel between 360 and 400 miles a week. I am always pumping between 8 to 9.5 gals and my DIC has never been more than .2 to .3 gals off.

 

[impster]

I just filled up my LS.

DIC showed 9.1 gallons used, and I filled it up (until the pump clicked off) with 9.1 gallons

C

 

[hoyaj]

So, I am having some issues on this on an LT1 at just over 1230 total driven. I filled it up fairly well at the last fill up. Considering that the tank holds 15.9 gallons and there are 16 tick marks on the fuel gauge, I was showing about 2 ticks lower on the analog gauge than on the DIC throughout the life of this tank of gas. Ok.

Today at 12.7 used, the low fuel light on, the needle pegged at red, and total to empty going from 41 to low fuel zone, I headed for the pumps with 13.0 used on the DIC. I rolled up with 30mpg and 390 miles driven since last fill indicated.

See where this is going?

So, the pump clicked off at 13.6. I squeezed it up to 13.968 until I could actually see the gas at the top of filler tube.

If we assume that the 13.6 is about right in terms of auto shutoff full values, it seems the fuel totalizing is off by about 5%, which gives me an unhappy moment knowing that actual mpg is thusly overstated by 5%.

That wouldn't be so bad, but 12.5% error on from the fuel sender means more trips to the gas pumps unless I manually compute miles driven against 95% of displayed mpg.

Sorry for the whining, but I'm not happy with anything I just wrote. I've flown 40 year old airplanes that can give me fuel usage down to +/- 0.1 gallons over 75 (just shy of 5 9's accuracy), so my standard for precision is high because the technology to do that is $800 aftermarket. Factory new engineering in present day should be able to do much, much better 87.5%, and for less.

Also is anyone else noticing that the a/c really takea bite out of the mpg. I thought compressors were supposed be much more efficient these days...?

 

[audog]

My fuel mileage is less, according to the DIC, while running the AC, but it's been near 100 F here for the last few days, and I'm not going to drive a black car with black interior with out the air!

 

[Vetterin]

Just about ran mine out of gas this morning. 496 miles and DIC showed 11.2 gals used. Filled up with 11.53 gals.

 

[TSURacing]

I have noticed that the DIC seems to keep better track of fuel used when doing mostly highway. My "mostly highway tanks show about .2 to .3 off while the "mostly city" tanks are more like .7.

 

[70AARCUDA]

...here's the DIC vs gas-pump ratios and distribution after 27 fillups for our LTZ:

0.90 0
0.91 1 ■
0.92 1 ■
0.93 4 ■■■■
0.94 1 ■
0.95 4 ■■■■
0.96 6 ■■■■■■
0.97 5 ■■■■■
0.98 1 ■
0.99 0
1.00 0 DIC = pump
1.01 2 ■■
1.02 0
1.03 1 ■
1.04 0
1.05 0
1.06 0
1.07 1 ■
...... 27

 

[Jersey]

Seems the 2012 Cruze still has the same issues. When I fill up my tank, I consistently get 1/2 to 1 gal more than what is shown on the DIC. Is means that the MPG shown is off by 5 to 10%! Perfect example on a recent trip the car showed a MPG of 37.0 but I had driven 340.8 miles and filled the tank with 10 gallons. That means I really got 34.1 MPG not the 37. I mentioned to the dealer and they said its just an estimate. Great way to estimate always overstating MPG by understating gallons used.