Optimal MPG for '05 ES330?

[cbrandiii]

What speed will produce the optimal MPG for an '05 ES330?

(I'm hoping RayO weighs in on this too.)

[Ray O]

Post by cbrandiii
What speed will produce the optimal MPG for an '05 ES330?
(I'm hoping RayO weighs in on this too.)

"Optimal" MPG is probably the speed at which the transmission shifts into
5th gear; my guess is somewhere around 35 or 40 MPH on level ground so the
transmission stays in 5th gear lockup.

At higher speeds, fuel economy will probably go down.

[stu]

0 mph

Post by cbrandiii
What speed will produce the optimal MPG for an '05 ES330?
(I'm hoping RayO weighs in on this too.)

[Ray O]

0 mph

At 0 MPH, you get 0 MPG ;-)

[Jay Somerset]

On Fri, 15 Jun 2007 23:35:48 -0500, "Ray O"

Post by Ray O

0 mph

At 0 MPH, you get 0 MPG ;-)

Assuming the engine running. :-)

Just to add to the general discussion -- the most fuel economic speed
for most internal combustion engines is where the torque curve peaks.
When you put an engine in a car, then you have to take air resistance
into account, which is more or less proportional to the square of the
car's speed. So in a car, then engine will be most fuel efficient at
a lower speed than the max torque point.

The only good way to determine this is to actually measure fuel flow
(or air mass flow, which is proportional) at various speeds.

[Ray O]

Post by Jay Somerset
On Fri, 15 Jun 2007 23:35:48 -0500, "Ray O"

Post by Ray O

0 mph

At 0 MPH, you get 0 MPG ;-)

Assuming the engine running. :-)

Isn't 0 miles traveled still MPG?

Post by Jay Somerset
Just to add to the general discussion -- the most fuel economic speed
for most internal combustion engines is where the torque curve peaks.
When you put an engine in a car, then you have to take air resistance
into account, which is more or less proportional to the square of the
car's speed. So in a car, then engine will be most fuel efficient at
a lower speed than the max torque point.
The only good way to determine this is to actually measure fuel flow
(or air mass flow, which is proportional) at various speeds.
--
Jay (remove dashes for legal email address)

Yup, I was trying to provide a practical answer to the OP's question.