1999 GMC Envoy Gas Tank Size & Fuel Capacity
Fuel tank capacity
18.0gal · 68 L
The 1999 GMC Envoy has a fuel tank capacity of 18.0 gallons (68 liters).
A full tank is good for roughly 342 highway miles or 252 miles around town, going by the EPA ratings.
18.0 gal · Smaller than 57% of 1999 models we list.
1999 GMC Envoy fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 4dr SUV 4WD 4.3L 6cyl 4A · 4WD MPG 14 / 19Range 252 / 342 mi | 4.3L 6cyl 4A | 4WD | 18.0 gal68 L | 14 / 19 | 252 / 342 mi | |
| No trim matches all of these filters. | ||||||
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.
How far a 1999 GMC Envoy goes on a tank
Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 16 MPG, a full 18.0-gallon tank covers about 288 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.0 | 342 | 252 |
| 3/4 | 13.5 | 257 | 189 |
| 1/2 | 9.0 | 171 | 126 |
| 1/4 | 4.5 | 86 | 63 |
| 1/8 | 2.3 | 43 | 32 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 938 gallons, roughly 52 full tanks.
Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.
What it costs to fill up a 1999 GMC Envoy
$76.86 to fill the 18.0-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 18.0 gal | Regular | $4.27 | $76.86 | $57.64 |
By region, 18.0-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $72.36 |
| Midwest | $4.27 | $76.86 |
| Gulf CoastLowest | $3.70 | $66.60 |
| Rocky Mountain | $4.46 | $80.28 |
| West Coast | $5.42 | $97.56 |
| CaliforniaHighest | $5.89 | $106.02 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 18.0-gallon tank$76.86
- A year of driving (15,000 mi)$4,003
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Envoy tank size in other years
The 1999 Envoy uses the same 18.0 gal tank as the 1998 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2005 Envoy | 22.0 gal | 440 mi |
| 2004 Envoy | 22.0 gal | 418 mi |
| 2003 Envoy | 22.0 gal | 440 mi |
| 2002 Envoy | 18.7 gal | 374 mi |
| 2000 Envoy | 18.0 gal | 324 mi |
| 1999 Envoy | 18.0 gal | 342 mi |
| 1998 Envoy | 18.0 gal | Not rated |
1999 GMC Envoy fuel system recalls
None of the 1 recall NHTSA lists for the 1999 GMC Envoy involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 1999 GMC Envoy?
The 1999 GMC Envoy holds 18.0 gallons (68 liters).
How many gallons and liters does the 1999 GMC Envoy gas tank hold?
The 1999 GMC Envoy tank holds 68 liters, or 18.0 gallons in US gallons.
How far can a 1999 GMC Envoy go on a full tank?
About 342 miles on the highway and 252 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.
How many miles can a 1999 GMC Envoy go on a quarter tank?
About 86 highway miles or 63 in town from the 18.0-gallon tank, which has roughly 4.5 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 1999 GMC Envoy take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 1999 GMC Envoy?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.0-gallon tank from empty costs $76.86. It ranges from $66.60 in the Gulf Coast to $106.02 in California.
How much does a full tank of gas weigh in a 1999 GMC Envoy?
About 112 pounds for the 18.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Has the 1999 GMC Envoy had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 1999 GMC Envoy involve the fuel system.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings. Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
- Recalls: NHTSA recall database (GMC fuel system recalls).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.