I get over 50 mpg highway driving moderately and 45 mpg if I'm in a hurry using 87 with my 2019 Jetta, way above the EPA rating of 40 mpg. Most recent all highway tank I got 47.52 mpg (hand calculated) with a 77 mph average speed according to the computer.When Volkswagen rated the new jetta for mpg and hp it was NOT while using 87
Turbocharged Volkswagen gets 93 every time. They simply run best. I don't care the new ones made for 87. They still get top octane. When Volkswagen rated the new jetta for mpg and hp it was NOT while using 87
Stock results are different (compared to what VAG advertises) because every dyno reads differently and we're using a different type, we have to estimate crank figures (We still provide the wheel figures we measured if you don't like the crank estimates), testing conditions are rarely identical to VAG's super controlled conditions (That could mean we're on a different part of the map that makes more or less power), variances from car to car, and this trend we're seeing where VAG cars seem to have a bit more headroom to make more than what they are advertising.
We actually went back and tried both octanes, stock. Higher octane didn't help performance at all. In some cases it can actually be a little less, especially up top. This is because the calibration is asking for only so much ignition advance and on this platform it's really dialed back. High octane burns slower, so if it's not needed, it will reduce output. Point being, if you're stock, run 87. You're wasting your money otherwise.
Not true. If VW advertises power and mpg using 91, while claiming 87 as the required gasoline, VW will have a notation and fine print stating that power and mpg achieved using 91 aki, YMMW. But this was not the case with the 1.4TSI for the Jetta or the 2.0 TSI-3B on the Tiguan or the Atlas VR6.When Volkswagen rated the new jetta for mpg and hp it was NOT while using 87