EAA - Experimental Aircraft Association     Avgas Grades  Avgas
80/87 is used in low compression ratio aircraft engines, and
contains little or no lead (up to .5 grams of lead per gallon is
allowed, but none is required). It is red in color, and should
not be used in any automotive engine due to a low motor octane
number of about 80.  Avgas 100/130 can be used in some
automotive engines. It has both research and motor octane
numbers slightly over 100. Avgas 100/130 is green in color,
contains four grams of lead per gallon, and is becoming hard to
find.  Avgas 100 LL (the LL stands for "low-lead") contains two
grams per gallon, half the lead contained in the avgas 100/130
it was designed to replace. It has research and motor octane
numbers very similar to 100/130 avgas. The color is blue. This
product sometimes has a high level of aromatics.  Avgas 115/145
was developed for high performance piston aircraft engines used
in World War II and the Korean conflict. It is very hard to find
today due to lack of demand