The first thing that I noticed with 87 octane gas in the tank is the amount of pep the vehicle has.

I have also noticed that the engine is eating more gas as the gas gauge is going down much faster than it does when 92 is in it.

The Tiguan owners manual recommends higher octane gasoline.

I have been putting 92 (93 when available) in ever since I got it.

I had to gas up today and decided to do a little test with 87 octane gas.

I will gas up the next 5 times with 87 octane gas to see if the gas mileage takes a hit.

You can follow the results on the Gas Mileage page.