aal234 Posted October 25, 2005 Report Share Posted October 25, 2005 Does anyone have any idea how much of an effect running air con has on your mpg? Being tight I like to get as much out of my 306 turbo diesel as possible! So for example how much extra fuel does it take to keep the in car temperature at 5 degrees less than outside? I know this will vary from car to car but any general ideas would be helpful. Link to comment Share on other sites More sharing options...
Rustynuts Posted October 26, 2005 Report Share Posted October 26, 2005 My mate with a Vectra loses about 4mpg with air con. I lose about 3 mpg so I turn the damn thing off (tight arse you see). Link to comment Share on other sites More sharing options...
pingpongpo Posted October 26, 2005 Report Share Posted October 26, 2005 My car (Golf 130PD Tdi) has better efficiency in the summer (Approx +10mpg) and that s with the air-con working hard to keep the temp inside the car down. I suppose this is what comes from having a black car with black interior though Link to comment Share on other sites More sharing options...
A3Floyd Posted October 26, 2005 Report Share Posted October 26, 2005 I've never noticed any difference when having the aircon on so i leave it switched on all of the time now. Was the same with all of my Audis, the S3 too. Only cars that I've noticed a big difference in is the Zafira and the Yaris. Not sure why. Link to comment Share on other sites More sharing options...
Soundwave Posted October 26, 2005 Report Share Posted October 26, 2005 [ QUOTE ] I've never noticed any difference when having the aircon on so i leave it switched on all of the time now. Was the same with all of my Audis, the S3 too. Only cars that I've noticed a big difference in is the Zafira and the Yaris. Not sure why. [/ QUOTE ] How is this possible! Surely it must drop a little bit? I thought that the air-con uses a fair bit of power when it is engaged? I read somewhere that it can be as much as 25% of the overall power as the air-con clutch engages. Which surely in-turn would mean that in order to maintain the same mpg with it switched on, you'd need to compensate for the that 25% by using 25% less power (or being 25% more careful)? Am i making any sense here? Link to comment Share on other sites More sharing options...
Durrsaku Posted October 27, 2005 Report Share Posted October 27, 2005 Yes you are and it does in general. I am not sure how much by though but at least on mine it drops by 4-5 mpg. Link to comment Share on other sites More sharing options...
sotty Posted October 30, 2005 Report Share Posted October 30, 2005 [ QUOTE ] My car (Golf 130PD Tdi) has better efficiency in the summer (Approx +10mpg) and that s with the air-con working hard to keep the temp inside the car down. I suppose this is what comes from having a black car with black interior though [/ QUOTE ] Noticed that too with my PD115, i get average of 48mpg running to work in summer with aircon(climatronic auto mode) on all the time, but now its down to 43-44!! weird!! Link to comment Share on other sites More sharing options...
theduisbergkid Posted November 3, 2005 Report Share Posted November 3, 2005 depends on how hard the system has to work (ie difference between insode and outside temps, but expect to lose about 5% on mpg. Link to comment Share on other sites More sharing options...
A3Floyd Posted November 3, 2005 Report Share Posted November 3, 2005 i reckon the engine torque must have an impact too. All of the cars that i've never seen MPG affected were cars with plenty of torque (TDI's and S3) whereas the Yaris struggled. With all of my Audi's, I simply leave the AC on all of the time, even in the winter. Dont ask why/how, i've not got a clue! Link to comment Share on other sites More sharing options...
pingpongpo Posted November 4, 2005 Report Share Posted November 4, 2005 Cooler air temp this morning and my mpg dropped off even though the aircon not working as hard? Link to comment Share on other sites More sharing options...
MattR32 Posted November 4, 2005 Report Share Posted November 4, 2005 Well now I've gone from under 24mpg to over 40mpg, I don't give two hoots about how much aircon affects the mpg. If it's hot or steamed up, I put it on. If it's not, I don't. I do however drive around with the lights off and PNV goggles at night to save a few joules, and I have disconnected any wasteful electric items such as power steering and ABS to make sure I get that extra 0.000001mpg. Link to comment Share on other sites More sharing options...
Durrsaku Posted November 4, 2005 Report Share Posted November 4, 2005 The car actually uses alot more fuel with a window open than with aircon on. Link to comment Share on other sites More sharing options...
Tobes49 Posted November 11, 2005 Report Share Posted November 11, 2005 [ QUOTE ] The car actually uses alot more fuel with a window open than with aircon on. [/ QUOTE ] Only above 55-60MPH Link to comment Share on other sites More sharing options...
R32North Posted November 11, 2005 Report Share Posted November 11, 2005 You all must have Scottish blood, what with your penny pinching, tight fisted ways!! Link to comment Share on other sites More sharing options...
Durrsaku Posted November 11, 2005 Report Share Posted November 11, 2005 Moi, only Albanian blood, honest. Link to comment Share on other sites More sharing options...
Sparky Posted November 12, 2005 Report Share Posted November 12, 2005 Guys!!! Don't we get enough MPG as it is, to be worrying about Air con running costs?! Link to comment Share on other sites More sharing options...
Durrsaku Posted November 12, 2005 Report Share Posted November 12, 2005 Used to switch the engine off everytime was going downhill to save fuel. Link to comment Share on other sites More sharing options...
danksy Posted November 12, 2005 Report Share Posted November 12, 2005 Thats dangerous mate because your servo assisted braking will stop, and your powersteering stops also Better just either leave it in a high gear with the clutch up (no fuel consumed, but you get engine braking), or otherwise just put your clutch in (fuel is used to keep engine ticking over, but no engine braking). PS surprised you didn't consider taking the spare seats out and only filling up £5 at a time to save on weight Link to comment Share on other sites More sharing options...
Durrsaku Posted November 12, 2005 Report Share Posted November 12, 2005 Done that too. Link to comment Share on other sites More sharing options...
Sparky Posted November 12, 2005 Report Share Posted November 12, 2005 :head_in_hands: Link to comment Share on other sites More sharing options...
pingpongpo Posted November 13, 2005 Report Share Posted November 13, 2005 Having a clean car also saves on fuel due to less air drag over the bodyshell. Link to comment Share on other sites More sharing options...
MattR32 Posted November 14, 2005 Report Share Posted November 14, 2005 I'm going to fill mine with helium, wrap it in cling film and use slicks to save on drag. Who needs to breathe when you have 50mpg? Link to comment Share on other sites More sharing options...
mooret Posted November 24, 2005 Report Share Posted November 24, 2005 [ QUOTE ] I'm going to fill mine with helium, wrap it in cling film and use slicks to save on drag. Who needs to breathe when you have 50mpg? [/ QUOTE ] and also only drive in the direction that the wind is blowing Yeah, the coats already on....... Link to comment Share on other sites More sharing options...
pingpongpo Posted November 25, 2005 Report Share Posted November 25, 2005 I have modified my engine so it only runs on 1 cylinder therefore I only use 1/4 of the fuel!! Link to comment Share on other sites More sharing options...
danksy Posted November 27, 2005 Report Share Posted November 27, 2005 Excellent Link to comment Share on other sites More sharing options...
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