Its good fuel, yes it has a lot of lead in it so o2 sensors dont like it at all,remember it is 100 octane,treat it as 98. It tends to dry out rubber lines ect. (not a problem with premix) also can cause a build up of the lead .the old green 110 was as good or better than most 110 race fuels,the purple 115/140 was great !! (ww2 type fighter planes running boost)dynoed it back to back with c16 in blown gas bbc btw.
I still run race gas over 100ll but it is way better than pump gas.
BTW DO NOT use the RED av gas its 85 octane !!!
Gasoline used for aviation fuel generally has two numbers associated with its octane rating. Examples of this include the (now almost completely unavailable) 80/87 avgas, and the 100/130 avgas. The first number indicates the octane rating of the fuel tested to "aviation lean" standards, which is similar to the Motor Octane Number (MON) rating given to automotive gasoline. The second number indicates the octane rating of the fuel tested to the "aviation rich" standard, which tries to simulate a supercharged condition with a rich mixture, elevated temperatures, and a high manifold pressure.
100LL, spoken as "100 low lead", contains a lead based anti-knock compound but less than the "highly-leaded" 100/130 avgas it effectively replaced. Most piston aircraft engines require 100LL but it is scheduled to be phased out in the United States because of the lead toxicity. An alternative fuel has not yet been developed for these engines. While there are similar engines that burn non-leaded fuels aircraft are often purchased with engines that use 100LL because many airports only have 100LL. 100LL contains a maximum of 2 grams of lead per US gallon, or maximum 0.56 grams/litre and is the most commonly available and used aviation gasoline.
82UL is an unleaded fuel similar to automobile gasoline but without additives. It may be used in aircraft that have a Supplemental Type Certificate for the use of automobile gasoline with an aviation lean octane rating (MON) of 82 or less or an antiknock index of 87 or less. It may not be used in engines that require 100LL. See Octane Rating. The FAA highly recommends installing placards stating the use of 82UL is or is not approved on those airplanes that specify unleaded autogas (mogas) as an approved fuel[1].
Gasoline (MOGAS) may be used in aircraft that have a Supplemental Type Certificate for automotive gasoline. Most of these applicable aircraft have low-compression engines which were originally certified to run on 80/87 avgas and require only "regular" 87 anti-knock index automotive gasoline. Examples of this include the popular Cessna 172 or Piper Cherokee with the 150 hp variant of the Lycoming O-320. Some aircraft engines were originally certified using a 91/96 avgas and have STC's available to run "premium" 91 anti-knock index automotive gasoline. Examples of this include some Cherokee's with the 160 hp Lycoming O-320 or 180 hp O-360 or the Cessna 152 with the O-235.
Avgas 80/87 has the lowest lead content at a maximum of 0.5 grams lead per U.S. gallon, and is only used in low compression ratio engines.
Avgas 100/130 is a higher octane grade aviation gasoline, containing a maximum of 4 grams of lead per US gallon, maximum 1.12 grams/litre. 100LL "low lead" was designed to replace avgas 100/130.
In the past other grades were also available, particularly for military use, such as avgas 115/145 and 91/96. Note that the octanes of avgas cannot be directly compared to those of mogas, as a different test engine and method is used to determine the octane. The first (lower) number is the lean mixture rating, the second (higher) number is the rich mixture rating. For mogas, the octane rating is typically expressed in the U.S. as an anti-knock index (known as "pump rating"), which is the average of the octane rating based on the research and motor test method ((R+M)/2).
Fuel dyes aid pilots in identifying the proper fuel in their aircraft. 80/87 is red, 100/130 is green, 115/145 is purple (leading to the U.S. Naval aviation slang term "grape juice" for avgas) and 100LL is blue, while jet fuel, JET A1, is clear or straw, being undyed. Untaxed diesel fuel for off-road use is also dyed red.
