Trip Computer- MPG Estimate vs. Actual

VCuomo · 07-10-2009, 12:12 AM

Quote:

Originally Posted by need4speed

Lol. 15.73 gallons is getting u 333. Somethin miles an hour.
I think that's good enough info. If u think about it different things will
Change that constantly such as. Are u driving on inclines. Making more left
Turns.
Are there more impuritities in this weeks batch of gas vs last week.
City vs highway ratios will change.
Its almost pointless unless you are getting to little mileage below its range.
And vq engines after around 5k to 7k miles. Increase in fuel economy
Drastically. You will probably see 23 to 24 combined in a few months.

I don't think you understand... He's not saying that the MPG varies from tank to tank (which, as you point out, it will), he's saying that if he manually computes the MPG it will be different from what the car's computer says the MPG is for the same tank of gas.

need4speed · 07-11-2009, 01:12 AM

Quote:

Originally Posted by VCuomo

I don't think you understand... He's not saying that the MPG varies from tank to tank (which, as you point out, it will), he's saying that if he manually computes the MPG it will be different from what the car's computer says the MPG is for the same tank of gas.

I feel you... I kinda see what u mean. He's trying to test accuracy in the sense of 15 gallons equals 333 mi. At 22.1 mpg. But the computer keeps a reoccuring track of the gas.
So let's say he started doing that with 200 miles on the car. But never calculated from 0 miles. Wouldn't that be his .7mi difference? Its really a small number. I think if he kept doing it for a few thousand miles. Eventually he will become accuate by .1. That's kinda the point I'm makin.
Feel me?

tooohip · 07-11-2009, 10:18 AM

Quote:

Originally Posted by need4speed

Feel me?

No

davidyan · 07-11-2009, 11:31 AM

Quote:

Originally Posted by need4speed

He's trying to test accuracy in the sense of 15 gallons equals 333 mi. At 22.1 mpg. But the computer keeps a reoccuring track of the gas.
So let's say he started doing that with 200 miles on the car. But never calculated from 0 miles. Wouldn't that be his .7mi difference?

Actually, I reset the computer each time right when I get back in the car. I think its prob the pump stopping at different points like others have mentioned.

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