The ethanol causes more problems with carburetors and other fuel system parts than internal engine mechanical troubles. Ethanol-added fuel goes stale much faster, so unless your truck is a daily driver, you'd better use fuel stabilizer regularly. Some early type rubber parts have a habit of developing leaks when exposed to ethanol, and there's a possibility that some of the epoxy coatings that get applied to the inside of fuel tanks can deteriorate when exposed to ethanol. Basically it's nasty stuff! Carb King calls it "deathanol"!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!