Now the DIC in the other GM cars I've had the DIC's were within 1-1.5 mpg of my manual calculations.

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Now the DIC in the other GM cars I've had the DIC's were within 1-1.5 mpg of my manual calculations.

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The DIC computes gas mileage based on the gallons used. You compute mileage based on how many gallons you pumped into the car. If you pumped in more or less than the car actually used you'll see an error.

I guess what I'm saying is you would need to start off with a topped off tank, then when you refill you would need to fill it up to exactly the same fill level to get an accurate number of gallons used.

Ray, I would try to run the calculation based on three or four tanks of gas to see if the amount of error decreases.

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I haven't done the comparision, but I will shortly. I zero'd one of the trip odometers at my last fill up.I was beginning to wonder if anyone else has noticed this problem.

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Maybe with a strong tailwind.

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The DIC in my GP was reasonably accurate enough that I stopped manually checking the MPG.

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1-1.5 isn't bad and thats what I'vw been getting in other GM vehicles that I've owned. However, my Malibu has been nearly 4mpg off two different times.

What have others been getting on average. My wife is about 25% city and 75% hiway with her commute.

By the way chevEE that's a nice looking Camaro. I had a black 01 SS a few years ago and damn do I miss that car.

Obviously the tank error is not an issue in my case since I'm keeping track of every fill up and this DIC is not very accurate. The DIC error is surprising to me since my other vehicles that I've owned which calculated avg mpg indicated lower than the real calculated mpg. Maybe I should start tracking the DIC avg in the log also to track the error to see how much it varies.

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This is great to know. I'm thinking about getting the LTZ but I'm a little leary about the 26 MPG highway rating. My GP is rated at 19/28 and I can get 25-26 MPG average with 75% highway/25% city driving. If I can get similar results out of the Malibu I'll be happy.

I completely reset all info on the DIC everytime I fill up after I do my calculations. I reset trip A&B average mpg, average speed, everything. IMO a consistant 1 even 2 mpg high or low would be OK but a ± 3 mpg swing seems a bit excessive.

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I think the average MPG shouldn't be reset. It's meant to give a long-term average. Of course, I'm only on my second fill-up (not including the free tank the dealer gave me).

I completely reset all info on the DIC everytime I fill up after I do my calculations. I reset trip A&B average mpg, average speed, everything. IMO a consistant 1 even 2 mpg high or low would be OK but a ± 3 mpg swing seems a bit excessive.

At the moment my calculation for one tank for gas was 25.002 MPG, where the DIC was saying 23.4MPG.

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In fact I filled the truck up yesterday and calculated 18.2 mpg (406miles/22.3gallons) and the DIC was 17.4mpg average.

DrD

The less gas you put in, the more margin for error. Run your tank all the way down and then calculate it.

I completely reset all info on the DIC everytime I fill up after I do my calculations. I reset trip A&B average mpg, average speed, everything. IMO a consistant 1 even 2 mpg high or low would be OK but a ± 3 mpg swing seems a bit excessive.

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