haha...
I noticed something recently....
I decided.... over a month ago- to start using mmo religiously in the gas tank, i didn't notice much of anything... started recording fuel economy around that time... and when I learned that my fuel economy was worse than I realized (14-16MPG).. I did a few things... had new exsaust mounted up.. free flow cat/muffler, slightly bigger pipe, to replace the old clogged up exsaust.. I put new spark plugs and wires and such on there, I started getting ~17-19MPG range(over 6 tanks)... I was pleased... then recently... I weaned off the mmo... on the last 3 tanks... economy dropped down to the 15-16 range... I was under the impression that most users of mmo found eithor- no improvement in milage, or reduction in milage.. maybe it's all just a coincidence.... also.. it's been cooler these last few tanks... colder tires could mean less air pressure- denser air also would mean the engine would burn with a bit more fuel. hehe..... i'm going to start with the mmo again after my arx treatment, see if it "jumps" back up to where it was when i stopped.