thx for that. u may be right. running the compressor only during engine braking may not get the job done. Electric AC compressor then should be the only way to free the engine from the compressors burden. The hybrid F30 seems to offer it. Reducing the burden of the AC compressor, steering motor and the battery alternator from the engine should add atleast 2 KM more to the liter and shave off 2 seconds in the 0-100 Kmph sprint.
With the F30, BMW seems to the sorted the later two.
