[Tupelo]

The car should run on an up to 10% ethanol blend. Which is what the government is giving us currently. My guess is your mechanic is referring to the fact that ethanol really is susceptible to turning to jello when exposed to water. And the ethanol attracts moisture. I see this a lot in my business. Motorcycles that sit for a month or so just will not run. The jets in the carburetors are small enough that the gum from the ethanol plug up. The carbs then have to be taken apart and cleaned. So I would guess that your injectors are doing the same thing. Especially if your Nissan has direct injection. What I recommend to my customers is to run some injector cleaner in their gas to counter this. It works, but a caveat. Do not get carried away. if a little is good, more is not better. Put in what the mfg says.
Another problem with ethanol it will gvie you approximatly 10% less horsepower and less fuel mileage. I hope this helps.

[HiTech RedNeck]

I have had fairly good luck with a 2000 carbed Harley using ethanol fuels, but I use double the normal amount of Sta-Bil in the tank as well as using Iso-Heet if I think I’m having water problems.

[count-your-change]

” My guess is your mechanic is referring to the fact that ethanol really is susceptible to turning to jello when exposed to water. And the ethanol attracts moisture. I see this a lot in my business. Motorcycles that sit for a month or so just will not run.”

Water and grain alcohol turn to jello? Is that why bottles of whiskey (alcohol and water ) turn to jello? But since they don’t I would say the reason jets gum up is the gasoline additives, a problem always with gasoline that sets a while.