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Yup. I have 2 fresh 318s that one is carbureted and tuned with AFR meter and O2 sensors the other is EFI. Similar gears, 2.94, in a Coronet and Duster. They get 12-13MPG on nice 65 MPH open roads and occasional freeway. The 360 I just built for the Valiant (similarly tuned) get 12MPG with...

The problem is these comparisons are rarely the result of an exhaust that has been designed specifically for the application. If you design a dual with the crossover it will likely out perform the single across the entire band. The single is just an easy way to get the crossover in a close spot...

The math backs it up as well

The Accurate has the collector type Y and all. I’d go for that! Dare to be different!

To add if you drive like I do the number of times I cared if the exhaust flowed better (only a high RPM benefit) is zero. The loss of low end torque because I did not put a crossover pipe is something I would use. The single exhaust this is free :)

I put their dual conversion on my 318 Coronet. It sound cool, other than that for what you and I seem to care about there is no real value. The 66 Valiant I’m working on is getting the HP single they make were they make the Y more like a collector vs just a junction.