My Accent definitely bogs with the A/C on but once I get cruising it's not too bad. Love Alan Parsons' music. Some very underrated music there.My 2003 Sentra used to feel like it bogged the engine down to run the AC.
I plugged a 16 GB flash drive into the USB port the other day with about 8 Alan Parsons Project MP3 albums on it, including Time Machine and Keats. The sound I got was amazing. Since then I've been playing that a lot in the car. You can hear it much better with the windows all closed but it's too hot for that this time of year.
It shouldn't matter what speed the fan is set to. It's not the speed of the fan that costs fuel mileage, it's the compressor running. How much the compressor runs is unrelated to the fan speed.
...couple things you're not considering...compressor isn't always on (unless Max'd), and if you open a window for air circulation...you are loading the motor from the drag.AC on = more engine work = less mpg. Basic formula is pv/t = pv/t
Completely agree with this. Most modern cars fall into this category. Modern A/C compressors also require significantly less energy to turn under load then they did in the past. I’d agree at least on the interstate having your windows open probably would hurt your mileage worse then using A/C. Regardless you are talking about maybe less then a dollar per fillup to use it so does it really matter if it burns more?In general with newer cars at higher speeds (20 mph and above) milage will be better with the AC on then with the windows open due to aerodynamics
Good points. I guess the takeaway is that the speed of the fan does negatively impact fuel mileage, but the difference is negligible.While that's largely true, it's not completely true.
The amount of air flow through the evaporator will affect how much heat the AC system is removing. The more heat removed, the more work it is doing, so the harder it is for the engine to turn the compressor. That said, the difference in compressor load from low fan to high fan is pretty minor, and it less than the difference in load between a warm day and a hot day.
Also note that the fan itself is not free. The power to run the fan comes from the alternator. The more power the alternator has to produce, the harder it is for the engine to turn the alternator.
All that said, the use of the AC and the fan is a very minor reduction of gas mileage. If you want the best mileage at the cost of everything else, get a bike.