Does the 2025 GMC Sierra 3500HD need premium gas?

No. Diesel.

$0extra a year

Miles a yearGas, $ a gallonPremium gap, $ a gallon

12,000 miles a year. Gas $3.20. Premium $0.60 more.

288 models (2025). One trim per model: the cheapest with a grade.

2025 GMC Sierra 3500HD: fuel grade by trim
Trim	Engine	Grade	Mpg	Regular, a year	Premium, a year
2WD Reg Cab 142" Pro	6.6L	Diesel	16 to 26	N/A	N/A
2WD Double Cab 162" Pro	6.6L	Diesel	16 to 26	N/A	N/A
4WD Reg Cab 142" Pro	6.6L	Diesel	15 to 24	N/A	N/A
Pro Crew Cab RWD	6.6L	Diesel	16 to 26	N/A	N/A
Pro Crew Cab LB RWD	6.6L	Diesel	16 to 26	N/A	N/A
2WD Reg Cab 142" SLE	6.6L	Diesel	16 to 26	N/A	N/A
4WD Double Cab 162" Pro	6.6L	Diesel	15 to 24	N/A	N/A
2WD Double Cab 162" SLE	6.6L	Diesel	16 to 26	N/A	N/A
Pro Crew Cab 4WD	6.6L	Diesel	15 to 24	N/A	N/A
Pro Crew Cab LB 4WD	6.6L	Diesel	15 to 24	N/A	N/A
4WD Reg Cab 142" SLE	6.6L	Diesel	15 to 24	N/A	N/A
SLE Crew Cab RWD	6.6L	Diesel	16 to 26	N/A	N/A
SLE Crew Cab LB RWD	6.6L	Diesel	16 to 26	N/A	N/A
4WD Double Cab 162" SLE	6.6L	Diesel	15 to 24	N/A	N/A
SLE Crew Cab 4WD	6.6L	Diesel	15 to 24	N/A	N/A
SLE Crew Cab LB 4WD	6.6L	Diesel	15 to 24	N/A	N/A
SLT Crew Cab RWD	6.6L	Diesel	16 to 26	N/A	N/A
SLT Crew Cab LB RWD	6.6L	Diesel	16 to 26	N/A	N/A
SLT Crew Cab 4WD	6.6L	Diesel	15 to 24	N/A	N/A
SLT Crew Cab LB 4WD	6.6L	Diesel	15 to 24	N/A	N/A
AT4 Crew Cab 4WD	6.6L	Diesel	15 to 24	N/A	N/A
AT4 Crew Cab LB 4WD	6.6L	Diesel	15 to 24	N/A	N/A
Denali Crew Cab 4WD	6.6L	Diesel	15 to 24	N/A	N/A
Denali Crew Cab LB 4WD	6.6L	Diesel	15 to 24	N/A	N/A
Denali Ultimate Crew Cab 4WD	6.6L	Diesel	15 to 24	N/A	N/A
Denali Ultimate Crew Cab LB 4WD	6.6L	Diesel	15 to 24	N/A	N/A

What this cannot tell you

Check the fuel door or manual before you fill.

Gas prices and the premium gap change by state.