Gasoline effectivity extremely delicate to AC settings: My experiment outcomes


When you swap the air con from auto to another mode, gasoline effectivity appears to drop sharply.

BHPian tanmay 2612 just lately shared this with different lovers.

I had earlier noticed that the gasoline effectivity of my Volkswagen Taigun 1.0 TSI MT was delicate to AC controls. I felt that the FE would drop if I modified from Auto to another mode. When you swap from Auto to another mode with even reasonable fan pace and temperature, FE appears to drop sharply. Nearly by 1.5-2.0 Factors per L. Identical factor on Freeway in addition to metropolis.

On a latest journey (+200Km a method) when AC was maintained at Auto with temperature set at 21-22 the gasoline effectivity was coming as anticipated (~round 17-18 kmpl on excessive approach run) however with temperature at 21-22 and blower at level-3 I used to be getting round 15-16 kmpl. I noticed that there’s a vital enchancment in cooling ranges when shifting from Auto mode to guide.

Nonetheless after suggestions and feedback from fellow BHPians, I made a decision to to discover a good path to examine my observations. I lastly bought an opportunity final weekend.

I saved the temperature set at 23C and used Auto mode for first half of the journey after which used 23C with guide mode and fan set at L2. I opted to make use of the morning window when the visitors and alerts will not be notably excessive. Additionally, temperatures are manageable.

I used the identical path to journey onwards and again to keep away from any distinction arising out of the street, elevation, and so on.

Lastly i attempted to maintain the pace and driving fashion managed and prevented any sudden accelerations to keep away from its affect on the FE.

Please discover the 2 snapshots, one taken halfway of the drive and second on the journey finish.

One distinction was that I had one extra particular person whereas touring until halfway.

General observations as per the hooked up info is that if temperature is saved similar and blower will not be working too exhausting, the FE drop will not be current. Moderately as a result of another issue I’m not certain which one, I bought higher effectivity on the return.

For the subsequent step, I must do that throughout peak temperature time to grasp the distinction extra precisely.

Including to the opposite matter on gasoline. A great high quality gasoline is definitely returning me higher efficiency total compared with common gasoline. At the moment going with Shell as its situated simply 2 minutes from the place I keep.

Here is what BHPian darthvader5000 needed to say on the matter:

You are saying its greatest to depart it at auto? One would suppose that the bottom rpm for the blower coupled with 21/ 22 levels and even 23,could be higher. What is the auto mode temperature reduce off set at, if identified?

That is fairly an replace if true. Gasoline effectivity is definitely bothersome with worth of automotive and gasoline ( although my view is that it’s the taxes which might be making each look dear). Am getting round 8 to 10 kmpl in metropolis and guessing round 14 on freeway. Undoubtedly need it to be round 12 and 16 respectively.

Here is what BHPian prabhu7944 needed to say on the matter:

That is fairly an replace if true. Gasoline effectivity is definitely bothersome with worth of automotive and gasoline ( although my view is that it’s the taxes which might be making each look dear). Am getting round 8 to 10 kmpl in metropolis and guessing round 14 on freeway. Undoubtedly need it to be round 12 and 16 respectively.

Take a look at BHPian feedback for extra insights and data.



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