I see many Tundra owners complaining about their gas mileage and I wanted to throw this out there. I am averaged 12.5 L/100kms on my recent vacation traveling approximately 4000 kms with 80% hiway & 20% city. My bed was full and it was just me and my wife. I get decent mileage on long trips. I normally get around 15L/kms on average cruising around Edmonton but I found a sweet spot when cruising on the highway by setting it at 118kph (73ish mph) with the tach below 2000 getting 12.5L/kms. In comparison, when cruising at 125kph (78ish mph), it goes to 14.8L/kms. The only things I changed was I added the all weather BF Goodrich Advantage TA (20") with a high rotation for increase gas saving. Excellent in deep snow, slush, wet, dry weather but sucks on black ice at normal highway speeds. I changed to the Mobil synthetic 0W20 with a secret additive to boost better gas mileage. I added a picture for some of the sceptics out there.