Hello, Noob,
Are you still around? Let's try answering your questions. In order to figure out the impact of various loads, we need some rules. So, I will make some up. First, we need a baseline car to look at. We are all hypermilers here, so the baseline will be an "ecomod special" that gets pretty good mileage. Here are the numbers I chose--
For the condition of interest, it takes 6 kW of power to move the car down the road. This is the actual "load," the power delivered to the tires:
Driving load..........6 kW (Energy delivered to the wheels)
Which translates to---
Gasser at 27%.....58 mpg (With 15% other losses)
EV at 70%.........227 Wh per mile = 150 mpge (at 34 kW /gal)
So, what if we just assume that all other loads have a 15% waste factored in? Then we can compare them directly to the 6 kW.
Running lights, about 250 watts?..............4% mileage penalty with lights
How much for power steering?
Okay, let's look at the list of questions--
1) The Heater (Does low or high make a difference?)
ANS: Maybe 50 watts max. for the fan.........1%
2) The Defrost (I think I heard it does steal some MPG)
ANS: If the AC runs, maybe 250 watts?........4%
3) Small things in the power outlet (like a GPS or L.E.D. or something)
ANS: Maybe 20 watts?..............................0.3%
4) Big things in the power outlet (like a 100 or 200 Watt converter thingy)
ANS: 200 watts to something.....................3.3%
5) The Radio (Does low or high volume make a difference?)
ANS: 100 watts radio + 3 watts for loud.......1.7% + .05% for loud
6) Electricity of running the wind shield wipers
ANS: Oops, sorry, I don't know. 100 watts?..1.7%
Leadfoot driving.......................................20%
So, there you are.
Ernie Rogers
Quote:
Originally Posted by HypermilingNoob
Ok so it is very obvious that the a/c is always talked about as stealing MPG. But what about these other things? And how much? Remember to be as specific as possible because if you say "it hurts a little" that could mean to me 0.001 MPG difference or 0.5 MPG difference...
1) The Heater (Does low or high make a difference?)
2) The Defrost (I think I heard it does steal some MPG)
3) Small things in the power outlet (like a GPS or L.E.D. or something)
4) Big things in the power outlet (like a 100 or 200 Watt converter thingy)
5) The Radio (Does low or high volume make a difference?)
6) Electricity of running the wind shield wipers
And don't side track and try telling me about how dangerous it would be to go without the wind shield wipers or something because that is obvious and I wouldn't anyways. I figured these things might use up MPG from running the alternator harder or something?
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