Gmc Sierra Denali 2025 2025 Mustang. While gmc says the estimated combined fuel economy numbers for the sierra denali is 14.3 litres per 100 kilometres, my test of the truck returned an average of 18.0 l/100 km. 2025 gmc sierra 2500 hd denali ultimate;
Abundance of great engine choices. While gmc says the estimated combined fuel economy numbers for the sierra denali is 14.3 litres per 100 kilometres, my test of the truck returned an average of 18.0 l/100 km.
