We've had ours for almost two weeks and have almost 700 miles on. We haven't received the letter yet.
Our first tank hand-calculated out to 33.8 in mixed driving, with the majority of those miles being the wife's 30-mile round trip commute. I'm getting ready to top it off again, and I'll update my reply when I do.
If this fix and/or reflash significantly diminishes the power or mileage of our new Equinox, I'm not going to be a happy camper......
*Update* tonight's fill-up of 13.11 gallons (In 473.5 miles) calculated out to 36.117 mpg.
2018 Equinox Premier DIESEL
Last edited by FlavorDave; 01-28-2018 at 01:15 AM.