Swtnlow

nicotino15

Yes, lots of people are running E20-E35 blends on a very frequent basis. Go look in a B8/B8.5 forum, or any other boosted vehicle forum, it is very very popular. Nobody runs straight E85, that doesn't make sense on these cars, most everybody is definitely running E10 since that's was most gas stations provide now. I wouldn't do it unless you are tuned, but even if you are not you will see IAT and timing changes as the ECU adapts to the properties of the higher E content. You will not find much support here as it's a Q5 forum, go look at more tuner-friendly forums and you'll see plenty of examples running thousands of miles on mixes just fine.

Swtnlow

texasDFWS4

There are plenty of B8.5 cars running E85 (which is as low as E65-70 sometimes) and are tuned for it. EPL and Unitronic are tuners that allow you to tune from home and as such can take advantage of the E85 for a alternative for race gas. That being said they have fuel monitors installed that tells them the E values and most need to replace the fuel pumps to accommodate. After a few years they have found that the Ethanol has a staining effect on the intake manifold but other then that the fuel rails and fuel lines were still in great shape. it makes no sense to use ethanol unless you have the ability to tune for it. If you ask the people that are tuned for it, you will find that E30 is a sweat spot for the power and no hardware changes are needed.

LocoMoco

Thanks for the info! Was driving through New Mexico to a balloon festival and was wondering. My Audi fuel recommendation for a 2018 Q5

2018 Audi Q5 fuel recommendation

E15 fuel

uberwgn

Loco, your car can handle up to E15 and the gas station is selling you E15 fuel. What is the concern?

KaDe was asking about something completely different; He wanted to run E85 in a vehicle not rated for it. There were a few Audis sold in the USA rated for E85 fuel, called FlexFuel engine. Not sure they exist any longer.