Car wrecked. - Page 7

Compaq888 · 06-09-2006, 04:31 AM

Quote:

Originally Posted by SVOboy

Was the fender some sort of aftermarket copy?

yes.

The car is now without front undertrays and 5 less psi than it should be. It looks like it's getting 2-3mpg less because of it.

MetroMPG · 06-09-2006, 04:36 AM

Quote:

Originally Posted by Compaq888

The car is now without front undertrays and 5 less psi than it should be. It looks like it's getting 2-3mpg less because of it.

How far have you driven it since the trays and PSI were changed? How are you measuring the difference in MPG?

Compaq888 · 06-09-2006, 04:39 AM

Quote:

Originally Posted by MetroMPG

How far have you driven it since the trays and PSI were changed? How are you measuring the difference in MPG?

I drove it 30 miles. With 55psi and undertrays it usually hits the fully mark at 35-40 miles. Now it hit it at 22 miles. My gauge is very accurate as long as I'm on a level road and driving straight.

When I'm doing all freeway and going 65mph it hits the 3/4 at 130 miles. With mixed driving 90 miles.

MetroMPG · 06-09-2006, 04:48 AM

Quote:

Originally Posted by Compaq888

With 55psi and undertrays it usually hits the fully mark at 35-40 miles.

In what type of driving?

Quote:

Now it hit it at 22 miles

From what type of driving?

krousdb · 06-09-2006, 05:03 AM

Quote:

Originally Posted by Compaq888

My gauge is very accurate as long as I'm on a level road and driving straight.

What, did you have it calibrated or something? Fuel gauges are not designed to be accurate. They are only for an approximation of fuel left. Also, they tend to be very non-linear. Using a fuel gauge to estimate FE is like trying to tell what time it is by looking at the sun on a cloudy day without the help of a sundial.

Compaq888 · 06-09-2006, 02:37 PM

Quote:

Originally Posted by krousdb

What, did you have it calibrated or something? Fuel gauges are not designed to be accurate. They are only for an approximation of fuel left. Also, they tend to be very non-linear. Using a fuel gauge to estimate FE is like trying to tell what time it is by looking at the sun on a cloudy day without the help of a sundial.

You can't tell what time it is when you look at the sun???
I can tell what time it is and which direction I'm facing just by looking at the sun.

Looking at the fuel gauge I can estimate my fuel supply to a .3 accuracy. If you look at it long enough. That is why I have never run out of fuel. Fuel gauge is not that accurate, it has faults too. Here is when it's inaccurate...

1. When you start up your car, it takes a minute or two for it to get calibrated.
2. When you are making a turn
3. When the ground is not flat
4. When the car is off
5. When you go WOT
6. When you brake too hard

Compaq888 · 06-09-2006, 02:39 PM

Quote:

Originally Posted by MetroMPG

In what type of driving?

From what type of driving?

both are the same driving, all freeway. Now I just have ~50psi and no front undertrays. That's why it's 22

SVOboy · 06-09-2006, 02:45 PM

I cannot, by looking at the sun, tell what time it is to the minute repeatedly and accurately. The thing about a fuel gauge that further complicates this is that it is nonlinear, which would be like the earth speeding up and slowing down randomly.

When you say .3 accuracy, how do you even know your accuracy, as there is no way for you to test that?

Compaq888 · 06-09-2006, 02:49 PM

Quote:

Originally Posted by SVOboy

I cannot, by looking at the sun, tell what time it is to the minute repeatedly and accurately. The thing about a fuel gauge that further complicates this is that it is nonlinear, which would be like the earth speeding up and slowing down randomly.

When you say .3 accuracy, how do you even know your accuracy, as there is no way for you to test that?

When I go to refuel I just guess a number and it comes out to it really close.