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Manute: 1970's era is not an older aircraft. The majority of airplanes out there are 40 years old or older. An airplane ages 1 year for every 10 years a car ages. My 1956 cessna 172 is relatively 4 years old. The reason why you don't see maintenance problems when YOU ALL use 100ll is because you haven't compared it to auto gas. Check out the piper or cessna websites/forums and you will see why you should change. You will save yourselves 10's of thousands of dollars by getting the stc for auto fuel and using auto fuel. The concensus among almost every older aircraft owner out there is that the only reason people use 100ll instead of auto gas in their older planes is because the Gov decided to call it aviation gas - and mechanics are making a fortune off pilots who are unwilling to change. This is why the 80 will soon be coming to an airport near you. I have nevr heard or read of anyone having the same maintenance problems or repair history with auto gas as they do 100ll. My 0-300 Cessna 172 has been going 1100 hours without a top end job. You will never see an older plane that uses 100ll go even 1/2 that long. The hours for a top overhaul with 100ll use at my airport is usually between 200 and 400 hours. Check the cylinder temps for newer vs older planes. The older planes do not get hot enough to burn the lead out even if you follow strict leaning procedures. The newer planes burn hotter so they can burn the lead out.
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