What decreases mileage

40 deg c is 104 deg f
Yes I don't know if the prius c is different in this way but my guess is if from a cold start there is a 12 sec pause then the engine comes on for 50 sec. then shuts off then it's probably the same setup as in the reg prius.
Temps where I live never get above 90 f so I always have to go through this stage.

 

I understand, I have no Gen 3, but I've also seem similar statements to that effect for Gen 2. Five stages document for Gen 2 is in a PDF at Scangauge: best threads for mileage improvement | PriusChat.

I don't totally buy those assertions, at least for Gen 2, judging by observed ICE RPMs, ICE sounds, and bta (current flow in/out of the HV battery). I can certainly cause the ICE to rev up and seemingly propel the vehicle while in my stage 1a. If it couldn't, I'd expect to have really weak acceleration and not much change in ICE RPMs (and sound) until FWT hits 104 F or 56 seconds have passed. This isn't the case.

This along w/getting 0 mpg while stopped w/the ICE running is why I don't sit and wait for it to shutdown before going. (And yes, I do see the -10ish values for IGN when the ICE is warming up, a few seconds after power up, confirming that I was in stage 1a.)

 

Roc, grab a ScanGauge or Ultra-Gauge. That will help you a lot with instant mileage showing right in front of your eyes. Was surprised Toyota did not include that on the C. I have both gauges. ScanGauge is preferred, by me, but costs 100 dollars more than what I paid 2 weeks ago for this Ultra-Gauge. I have not seen that kind of mileage drop on my C with air. We are taking a long trip this week and I will be checking it again.
Thanks for the video and link F8L.
Dan

 

Out of interest, does the instant bar on the right hand side of the 5 minute consumption screen not show what you are rerferring to?

I'm still trying to get my head around the warm-up stages. On my c the ICE does not start until I actually drive off and provide enough pedal input to call for it. At home I park in the bottom level of an underground carpark and the first time the ICE will come on is when I go up the ramp to the next level, although I'm experimenting with using the EV mode button to keep it in EV up that ramp, which will then allow me to remain in EV without it until I exit the carpark and actually get out on the road. If I don't do this, my "From Start" consumption jumps to 15.0 l/100km and stays there for some time, after which it is difficult to recover.

The car's behaviour after the ICE starts until it finishes the warmup stages puzzles me. I see elements of what is described in the various guides, but somehow it doesn't seem to quite "fit". Even after it goes back to cutting out when I stop, it sometimes doesn't seem to behave "normally" until awhile later.

I guess it won't be until I get a ScanGuage that I have any hope of really understanding it.

 

Yes, this seems to be the common description, but I can push the start button and sit in Ready mode for as long as I like. I've only twice had it come on while sitting there, both through my actions - one was turning the AC on, the other was deliberately pushing the pedal while in Park. This latter case caused the ICE to run for about 100 seconds. I think it was about 15°C (59°F) that morning.

 

Rob, I think that screen does provide as close as you can get to an actual instant readout of your mileage. But, I love seeing it right there. I can adjust my pedal to pop up the mileage when I see it is low. Sunday we drove from Dexter Mo. to Muncie, In. Our screen showed 53.5 mpg. I figured it when I filled up and it came out to a little over 52.5. Dang good I think. That was at 65 mph most of the way on I-57 and 70, then up 69. Today we drove from downtown Indy to Romeo, Mi. I was in a hurry and drove 71 mph, lots of rolling hills on 69. Got 47.5 mpg. Without the instant readout I could not have gotten what I did Sunday. Today, made no difference cause I was not trying to help it. Used the cruise. With air conditioning both days.
Dan

 

Tried using this display instead of the HSI on the ECO Score page for a change today on the drive to work now I'm getting used to how the car behaves on this route. I must say I think it did help. Whenever the ICE starts it does jump to 15 l/100km (which is the upper limit for us, remembering also that this is an inverse scale to your MPG), but it was interesting to see when and how it backed off and taking this into account with my inputs.

The commute to/from work is my biggest challenge as it is only about 4.5 miles.

 

What decreases mileage more than anything IMHO? poor driving habits such as quick starts/stops, additional weight in the car, low tire pressure, driving conditions such a rain, snow.

 

1. Speed
2. Driving conditions (Rain and/or wind)
3. Driving style
4. Tire choice
5. Tire pressure
6. Additional weight (pretty minor hit)

 

We had our car loaded coming up to Michigan. Did not seem to hit us too hard. 52.5, calculated, was not bad for the first 420 miles. Drove speed limit but used the pedal instead of cruise when in the rolling hills. When I look at the Instant fuel mileage and see I am getting mileage in the 40s, I lift just a shade and it will jump back up in the 50's, while maintaining the same speed. I can now feel the engine sounding a little more loaded til I lift. Wind is certainly a factor and got to us heading eastbound on 70 into Indianapolis.
Keep fooling around with it and your going to improve your overall mileage. I am new to the hybrid scene but have done hypermiling with the Vibe gt for some time. You are going to get a "feel" from the pedal, and soon.
Dan

 

A/C is inverter type and will use a lot at startup if car is parked on the sun (1700+ W) and then it can come down to as low as 300 W depending on outside and inside set temp, if demand is even lower it will cycle in on/off operation.
Normal halogen bulbs are what 55W each, LED HID lamps are probably even lower, LED DRL are not worth mentioning .
Defrost front heating (if c has it) is 2 x 300 W, back window have no idea.

If I have enough SOC I normally start in EV mode to drive 19 MPH (30 kph zone) somewhere in the middle I kick it out (excessive speed) and some 30 sec later I accelerate just a little in pwr band just to hear ICE is spinning a little faster (2500 rpm) and helping with acceleration, so I don't use too much SOC (in warm up, car uses battery for traction). If it's cold morning 50°F I first hit ventilation off, and turn it back on when the ICE is warm enough (5+ min) to heat the car without burning additional gas.

But still, this procedure will not get me above 50MPG in hard winter on my short commute (12 miles) to work.