If it was me, I'd get your sales rep to work with you on finding out the problem. IMO, having been using Schaeffers for over 8 yrs now, having sold more than you can imagine to many over the last 4yrs and being told stories many times over about neutra among other products, let me congratulate you as you are the FIRST to ever have a bout with neutra that has caused you over 50% fuel mileage drop. There's no way any fuel additive that could come close to that.
You can look at each item, consider what if anything that can cause this... my first thought is 50% drop? GAS.. Second thought, maybe you have crap in your tank that neutra helped clean thus maybe cloging your FILTER?. Then, lets see, oil? nope, never happen, so it's down to bad gas, filter or neutra, oh and possible theft. Well, neutra as you pointed out seems to have helped the running, that can't happen if the fuel mileage has gone down. Your engine, if running as good or better than before, cannot in no way lose over 50% of it's fuel mileage even with bad gas or additive. Either you've had fuel stolen, at work maybe? or maybe somewhere you park for some extended times while shoping? no idea, but it is impossible to have anything drop your mileage like that without some performance or other obvious problem. Just isn't going to happen.
If you were to fill back up, and drive it, and this mileage proble just goes away, then your problem was most likely fuel stolen while out in the open. If the problem persist's after refueling, then you have a mechanical problem.
Sorry A. but I am interested in knowing what has happen but I can assure you there's now way possible that any additive could cause this problem. I don't believe bad gas could either. I don't believe filter could. I do see how a clogged cat converter could but that would show up as poor performance. Also, forgot, I've seen where rust in a tank can spring really small fuel leaks in the tanks, especially if you live or drive over a gravel road where rocks get kicked up.
Another thing, if you really do come to the conclusion that 131 caused you any problems, document all of it, and your rep can put in a claim to schaeffers just for your info.
You can look at each item, consider what if anything that can cause this... my first thought is 50% drop? GAS.. Second thought, maybe you have crap in your tank that neutra helped clean thus maybe cloging your FILTER?. Then, lets see, oil? nope, never happen, so it's down to bad gas, filter or neutra, oh and possible theft. Well, neutra as you pointed out seems to have helped the running, that can't happen if the fuel mileage has gone down. Your engine, if running as good or better than before, cannot in no way lose over 50% of it's fuel mileage even with bad gas or additive. Either you've had fuel stolen, at work maybe? or maybe somewhere you park for some extended times while shoping? no idea, but it is impossible to have anything drop your mileage like that without some performance or other obvious problem. Just isn't going to happen.
If you were to fill back up, and drive it, and this mileage proble just goes away, then your problem was most likely fuel stolen while out in the open. If the problem persist's after refueling, then you have a mechanical problem.
Sorry A. but I am interested in knowing what has happen but I can assure you there's now way possible that any additive could cause this problem. I don't believe bad gas could either. I don't believe filter could. I do see how a clogged cat converter could but that would show up as poor performance. Also, forgot, I've seen where rust in a tank can spring really small fuel leaks in the tanks, especially if you live or drive over a gravel road where rocks get kicked up.
Another thing, if you really do come to the conclusion that 131 caused you any problems, document all of it, and your rep can put in a claim to schaeffers just for your info.