1st fill up mpg

It can only go up as you tweek your driving. I have been plugging in everywhere I can and haven't used any gas for the month of February! My goal is to use none for the whole month. We will see from there! Lol.

Posted via the PriusChat mobile app.

 

congrats! what did the calculated mpg come to at the pump?

 

Granted it's not even close to my first fill up

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This is as of last Saturday. 2 1/2 months on the same tank of gas. I ended up filling up after this picture was taken. Took 9 gallons to fill up. Added fuel stabilizer to the pure gas I put in. I am interested how long this tank will last!

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so, based on the two gallons of gas that I've use it turns out to be 468.6 MPG?

 

so, 6.5 gallons? that's 327.07 MPG!!!! whoo hoo!!

 

what was your actual calculated MPG after the fill up?

 

About 236 mpg. I decide to start with a clean slate since I found a way to charge at work without using gas at all. Reset both tripometers.

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DUBJ1313, great looking car. By the way, some kid on a skate board ran into your garage door.

 

Dude, your charging door is open !!

 

oops! (zzzzzipppp!!!!!) sorry

 

Why all the fuss about "MPG"? Given that the miles per gallon of gas depend on how much you use the EV mode, I don't think it makes a lot of difference. I love being in EV mode, but it is not like it is free, either in $ or environmental cost (electricity has to be produced, typically from fossil fuels as opposed to nuclear unfortunately). BTW, on the cost, I figure here in VA it takes about $1 to fully charge the battery (at 8c/kwh) which takes you about 25 miles vs.a gallon of gas taking you about 50 miles at $2.50. So it is only a slight cost savings to use the plug-in vs. the gas (about 25%). Let me know if I am missing something.

 

Awesome and great MPG! Next time I'm also waiting until the low-gas light turns on...been filling up at the 1/4 mark. Did you happen to notice how many gallons it took to fill-up?

 

Only if one plugs in the car. Driving 1,200 miles cross country, I needed to know what to expect from the 11.4 gallon tank. But I will be doing the same, no-charge, mph vs MPG that I've used with every other car. I'm just waiting on standard day temperatures.

Bob Wilson

 

spot on, linda. just newbies basking in their new found greenness. they'll figure it out in due time.

 

The engine, transmission, and tire warm-up penalty from a cold-start (i.e., over night) is a substantial penalty. It only takes about ~2 miles before the Prius goes from ~35 MPG to over 50 MPG but this warm-up penalty can be a substantial part of a daily commute. So my past experiments included block heater, transmission heater, and speculation about tire heating by inductive warming of the tire steel belt. But the EV mode is an effective short cut.

We use EV mode to reach a speed and THEN use HV mode to start the engine. This lets the engine warm-up in a low-power mode so the minimum fuel is burned for heating. This spreads the cold-start penalty over the early part of the trip with a substantial, total energy savings.

Now there is a hidden trick the next (or current) Gen-4 Prius could achieve by 'fill charging' the traction battery at the end of a trip. The rule would be:

WHEN ( (fully_warmed) AND (speed < = neighbor_hood))
{

SET target_SOC = 70-75%​

}​

This means the engine would run more at the end of a trip, efficiently banking the EV energy needed for the next trip. It would also alleviate the need to plug-in the car. Prius Prime efficiency for not just the ordinary Prius but every hybrid model.

There is a mirror image rule that works when the car is cold-start:

WHEN (cold_start)
{

SET target_SOC = 45-50%
IF (stopped) THEN

Engine_OFF​

ELSE

Run_engine_warm-up_minimum_load​

ENDIF​

}​

This lets the car use the stored charge to exit the neighborhood and achieve speed. The necessary engine warm-up burn still occurs but at the most efficient rate.

Bob Wilson