do brand new cars use more fuel at first
Generally for the first 500-1000 miles new engines are tight and will use a bit more fuel. You will see that the maker tels you not to exceed certain revs until the engine has bedded in.Years ago older engines had to be carefully run in up to max speeds for mileage covered. was under the impression as the engine was ran in the ECU had a learning curve and was it had done this then it was far more fuel efficent. Originally Posted by Rolebama. Generally speaking, whatever you get 'running in' a new car, is what you can realistically expect after it has run in.