AERO website page with fuel saving graphs contains the following disclaimer:
The below results are actual fuel mileages reported by customers who tested their vehicle before and after the Aero Performance Exhaust Turbine series mufflers was installed on their personal vehicle.
Results may vary depending upon environment, driving habits, and vehicle configuration.
All Aero Performance Exhaust productcts are made from the highest quality materials including 100% 304 & 409 Stianless Steel, which is extremely durable and rust resistant. All products are maticulusly polished to a reflective finish with high quality welds.
Other materials include Aero´s own high temperature ceramic packing, which delivers much better protection while reducing excessive noise.
The following test was performed in a strictly controlled environment. The test was performed to show temperature rating differences between Aero Ceramic Packing and our competitor's Rockwool packing and the advantage of having a high quality packing material inside your muffler.
For specific Questions about the Aero Performance Exhaust Muffler please see our FAQ page.
If you have further questions, please feel free to contact us anytime at 1-877-266-5356.
So, you see that they have already addressed your comment, "Given all things being equal, it is impossible for a muffler alone to produce these savings." They admit on the same page, as well as on the FAQ page that the fuel savings will depend on many variables. NOTHING misleading about that to me.
