2005 Mercury Mountaineer Gas Tank Size & Fuel Capacity
Fuel tank capacity
22.5gal · 85 L
The 2005 Mercury Mountaineer has a fuel tank capacity of 22.5 gallons (85 liters) on every trim.
A full tank is good for roughly 383–428 highway miles or 293 miles around town, going by the EPA ratings.
22.5 gal · Bigger than 67% of 2005 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Pump & gauge parts
- FAQ
2005 Mercury Mountaineer fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Powertrain
- no difference
- Drive
- no difference
- Engine
- no difference
All 12 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | Fuel | MPG city / hwy | Range city / hwy |
|---|---|---|---|---|---|---|
| Convenience AWD 4dr SUV 4.0L 6cyl 5A · AWD · Flex-fuel (gas or E85) MPG 13 / 17Range 293 / 383 mi | 4.0L 6cyl 5A Flex-fuel | AWD | 22.5 gal85 L | Flex-fuelgas or E85 | 13 / 17 | 293 / 383 mi |
| Convenience AWD 4dr SUV 4.6L 8cyl 5A · AWD · Regular MPG 13 / 17Range 293 / 383 mi | 4.6L 8cyl 5A | AWD | 22.5 gal85 L | Regular | 13 / 17 | 293 / 383 mi |
| Convenience Rwd 4dr SUV 4.0L 6cyl 5A · RWD · Flex-fuel (gas or E85) MPG 13 / 19Range 293 / 428 mi | 4.0L 6cyl 5A Flex-fuel | RWD | 22.5 gal85 L | Flex-fuelgas or E85 | 13 / 19 | 293 / 428 mi |
| Convenience Rwd 4dr SUV 4.6L 8cyl 5A · RWD · Regular MPG 13 / 18Range 293 / 405 mi | 4.6L 8cyl 5A | RWD | 22.5 gal85 L | Regular | 13 / 18 | 293 / 405 mi |
| Luxury AWD 4dr SUV 4.0L 6cyl 5A · AWD · Flex-fuel (gas or E85) MPG 13 / 17Range 293 / 383 mi | 4.0L 6cyl 5A Flex-fuel | AWD | 22.5 gal85 L | Flex-fuelgas or E85 | 13 / 17 | 293 / 383 mi |
| Luxury AWD 4dr SUV 4.6L 8cyl 5A · AWD · Regular MPG 13 / 17Range 293 / 383 mi | 4.6L 8cyl 5A | AWD | 22.5 gal85 L | Regular | 13 / 17 | 293 / 383 mi |
| Luxury Rwd 4dr SUV 4.0L 6cyl 5A · RWD · Flex-fuel (gas or E85) MPG 13 / 19Range 293 / 428 mi | 4.0L 6cyl 5A Flex-fuel | RWD | 22.5 gal85 L | Flex-fuelgas or E85 | 13 / 19 | 293 / 428 mi |
| Luxury Rwd 4dr SUV 4.6L 8cyl 5A · RWD · Regular MPG 13 / 18Range 293 / 405 mi | 4.6L 8cyl 5A | RWD | 22.5 gal85 L | Regular | 13 / 18 | 293 / 405 mi |
| Premier AWD 4dr SUV 4.0L 6cyl 5A · AWD · Flex-fuel (gas or E85) MPG 13 / 17Range 293 / 383 mi | 4.0L 6cyl 5A Flex-fuel | AWD | 22.5 gal85 L | Flex-fuelgas or E85 | 13 / 17 | 293 / 383 mi |
| Premier AWD 4dr SUV 4.6L 8cyl 5A · AWD · Regular MPG 13 / 17Range 293 / 383 mi | 4.6L 8cyl 5A | AWD | 22.5 gal85 L | Regular | 13 / 17 | 293 / 383 mi |
| Premier Rwd 4dr SUV 4.0L 6cyl 5A · RWD · Flex-fuel (gas or E85) MPG 13 / 19Range 293 / 428 mi | 4.0L 6cyl 5A Flex-fuel | RWD | 22.5 gal85 L | Flex-fuelgas or E85 | 13 / 19 | 293 / 428 mi |
| Premier Rwd 4dr SUV 4.6L 8cyl 5A · RWD · Regular MPG 13 / 18Range 293 / 405 mi | 4.6L 8cyl 5A | RWD | 22.5 gal85 L | Regular | 13 / 18 | 293 / 405 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 2005 Mercury Mountaineer 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 14 MPG, a full 22.5-gallon tank covers about 315 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 22.5 | 383 | 293 |
| 3/4 | 16.9 | 287 | 219 |
| 1/2 | 11.3 | 191 | 146 |
| 1/4 | 5.6 | 96 | 73 |
| 1/8 | 2.8 | 48 | 37 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 1,071 gallons, roughly 48 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.
- EPA combined
- 14–15 MPG
- Tailpipe CO2
- 592–635 g/mi
- Source
- EPA ratings
What it costs to fill up a 2005 Mercury Mountaineer
$96.07 to fill the 22.5-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 |
|---|---|---|---|---|
| 22.5 gal | Regular | $4.27 | $96.07 | $72.06 |
| 22.5 gal | E85 (flex-fuel trims) | $3.31 | $74.47 | $55.86 |
By region, 22.5-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $90.45 |
| Midwest | $4.27 | $96.07 |
| Gulf CoastLowest | $3.70 | $83.25 |
| Rocky Mountain | $4.46 | $100.35 |
| West Coast | $5.42 | $121.95 |
| CaliforniaHighest | $5.89 | $132.53 |
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
- 22.5-gallon tank$96.07
- A year of driving (15,000 mi)$4,575
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Mountaineer tank size in other years
The 2005 Mountaineer uses the same 22.5 gal tank as every Mountaineer since 2002.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2010 Mountaineer | 22.5 gal | 450 mi |
| 2009 Mountaineer | 22.5 gal | 473 mi |
| 2008 Mountaineer | 22.5 gal | 450 mi |
| 2007 Mountaineer | 22.5 gal | 450 mi |
| 2006 Mountaineer | 22.5 gal | 428 mi |
| 2005 Mountaineer | 22.5 gal | 428 mi |
| 2004 Mountaineer | 22.5 gal | 450 mi |
| 2003 Mountaineer | 22.5 gal | 428 mi |
| 2002 Mountaineer | 22.5 gal | 428 mi |
| 2001 Mountaineer | 21.0 gal | 420 mi |
| 2000 Mountaineer | 21.0 gal | 399 mi |
2005 Mercury Mountaineer vs similar 2005 SUVs
The Mountaineer has the largest tank of the seven 2005 SUVs compared here, 22.5 gallons against 22.5 for the Ford Explorer.
| 2005 model | Tank | Longest highway range |
|---|---|---|
| Mercury Mountaineer | 22.5 gal | 428 mi |
| Ford Explorer | 22.5 gal | 428 mi |
| GMC Envoy | 22.0 gal | 440 mi |
| Chevrolet Trailblazer | 22.0 gal | 440 mi |
| Buick Rainier | 22.0 gal | 440 mi |
| Nissan Pathfinder | 21.1 gal | 443 mi |
| Honda Pilot | 20.4 gal | 408 mi |
Other 2005 SUVs of a similar size, one model per brand.
2005 Mercury Mountaineer fuel pump and gauge parts
These are the part numbers the makers list for the 2005 Mercury Mountaineer. Check the fuel system recalls first: recall repairs are free.
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Frequently asked questions
What is the fuel tank capacity of the 2005 Mercury Mountaineer?
The 2005 Mercury Mountaineer holds 22.5 gallons (85 liters) on every trim we list.
How many gallons and liters does the 2005 Mercury Mountaineer gas tank hold?
The 2005 Mercury Mountaineer tank holds 85 liters, or 22.5 gallons in US gallons.
Does the 2005 Mercury Mountaineer tank change with the powertrain?
No. Flex-fuel (E85) and Gas versions of the 2005 Mercury Mountaineer use the same 22.5 gal tank.
Does AWD change the 2005 Mercury Mountaineer gas tank?
No. AWD and RWD versions of the 2005 Mercury Mountaineer use the same 22.5 gal tank.
How far can a 2005 Mercury Mountaineer go on a full tank?
About 383–428 miles on the highway and 293 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 2005 Mercury Mountaineer go on a quarter tank?
About 96 highway miles or 73 in town from the 22.5-gallon tank, which has roughly 5.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2005 Mercury Mountaineer take?
Flex-fuel (unleaded/E85), or Regular unleaded, depending on the engine. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2005 Mercury Mountaineer?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 22.5-gallon tank from empty costs $96.07. It ranges from $83.25 in the Gulf Coast to $132.53 in California.
How much does a full tank of gas weigh in a 2005 Mercury Mountaineer?
About 140 pounds for the 22.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2005 Mercury Mountaineer have a bigger gas tank than the GMC Envoy?
Yes. The 2005 Mercury Mountaineer holds up to 22.5 gallons; the 2005 GMC Envoy holds up to 22.0.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.