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I agree with you Kong but in this context I believe he's talking about attempting to increase performance with new exhaust/air filters which is going to decrease fuel efficiency when properly tuned. I don't think it would be a significant decrease however and nothing to be concerned with.
Am I correct in assuming that the larger the main jets are the higher the fuel consumption will be?
Also, when you replace the main jets (to compensate for exhaust or filter changes) do you need to replace the slower jets as well?
While intuitively it might seem like larger jets lead to higher fuel consumption like many things intuitive it may not be so. The key to jetting is not so much to find the largest jet that will work properly, its to find the jet that will work properly. In fact a properly jetted engine will run more efficiently than an improperly jetted on and the more efficient the engine is running the better fuel economy it will get. So its actually quite possible that in the process of taking a lean running (inefficient) engine to a condition where the optimal fuel/air ratio (efficient) condition exists may very well increase your fuel economy.