>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 May 2006 18:14
>To: Microcontroller discussion list - Public.
>Subject: RE: [ee] Basic physics... Bicycle regenerative braking forces
>
>
>On Tue, 2006-05-09 at 17:20 +0100, Michael Rigby-Jones wrote:
>> >Interestingly, despite all the "warnings", I've NEVER seen air
>> >conditioning effect my mileage at all. Now, I do drive bigger 
>> >cars with bigger engines (my Olds was a 3.8L V6, my current is 
>> >a 2.5L H4). I actually did a trial once in my Olds. I drove 
>> >with the AC on, got a mileage, drove with the AC off (and 
>> >windows closed) and the mileage was basically the same. I 
>> >don't have definitive results with my current car yet on AC 
>> >usage, but so far it seems mileage is pretty much the same, 
>> >whether I use AC or not.
>> 
>> 
>> On a large engined american car I guess the extra load of an A/C 
>> compressor is relatievly insignificant.  In Europe where smaller 
>> engine are the norm, the A/C definately affects fuel 
>economy.  On the 
>> very small engined cars e.g. 1000cc Nissan Micra you can 
>literaly feel 
>> the car slow when you switch the A/C on.
>
>Don't get me wrong, I can feel when the compressor turns on 
>and off, I just find it odd that even with a bigger engine the 
>extra energy used by the compressor doesn't appear to change 
>the fuel mileage by any noticeable amount.
>
>In your experience, what drop in fuel economy do you 
>experience when running that AC?

Not a great deal, maybe 1-2mpg when I am normaly returning a fairly consistent 32-34mpg. (1.8L Honda Civic).  I suspect I suffer more as it's the B18 engine with the limiter at ~8500RPM which gets tested occaisionaly :D Having such a high revving engine must mean more losses from the A/C compressor (and all the other ancilliaries as well).

Regards

Mike

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