One of our members is getting some very satisfactory results with his Meyer's cell on three different test vehicles.
He's showing a 57% improvement on a semitruck;
A 210% increase in a 1.6 liter Toyota car which figures out to 110 mpg;
A 115% increase in a 3.8 liter Grand Am Pontiac car with the same sized cell used in the Toyota.
I don't have any real particulars on the cell other than the car cells were 8-tube setups 24" in length with no chokes being used. Two 25 amp diodes were used but no chokes. Also, a Lawton circuit was being used. I have no information on the size of cell being used in the semi, but I imagine it is a much bigger cell.
He does say that the cell is easy to replicate and that any mechanical person should be able to do so. I will post more intel as it becomes available.
The gap is 1.5 mm and each of the outer tubes is slotted/vented.