that test did not run the oils at the instructed amount so the test is bias to petroleum higher ratio oils if you run your oils high than the recommended mix it will carbon up a lot faster they ran all oils at 50 to 1 so any oil spacificly for that ratio will win in any side by side test just like if they run all oils at 100 to 1 the would be a totally different out come on whom did better in what category to do this test properly you need to run the oils at the recomended ratios