MetroMPG, I'm not sure of your interpretaion of "tank to tank". I'm saying average several tankful readings to establish a viable base mpg. nothing will be perfect. I drove the Maxima 13 years with no change in mpg readings then all of a sudden with a large increase of milage coupled with same effect on the Altima I think there is strong evidence something happened, the question is what.
If we can establish a base reading over several tanks of gas and control factors that are controllable and note differences there should be a base level that can be agreed on.
If after installing the magnets there is a LARGE difference then we can argue why.
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