Originally Posted by RansRAM
You should have no problems at all with 87 octane and the 87 tune. Just give it a try and if you have any issues at all just put the stock program back on.
Winter gas is less an issue than summer gas, in the winter 87 tune, 87 Octane no issue, since the air is more dense you will have less possibility of pinging, in the summer always a good thing to go 89 on 87 tune, just that extra protection from possible pinging. JMO