Update, October 8, 2026 — fuel taxes suspended from October 1 to December 31. Decree 22-2026, sanctioned by President Arévalo and published in the Diario de Centro América on September 30, exempts premium and regular gasoline and diesel from the IDP fuel tax and from VAT from October 1 through December 31, 2026 (IDP is a fixed Q4.70 per gallon on premium, Q4.60 on regular and Q1.30 on diesel; VAT is 12%); the decree’s own estimate is a cut of up to Q9.41 per gallon for premium, Q9.10 for regular and Q6.34 for diesel, and the full exemption must be passed on to the consumer and shown on the electronic invoice (Diario de Centro América). The exemption took effect on October 1 (AGN, October 1) and on October 5 AGN reported that MEM had published the implementing regulation, Government Agreement (Acuerdo Gubernativo) 164-2026 (AGN, October 5). MEM’s own estimate of the saving per gallon is about Q9.05 for premium, Q8.33 for regular and Q6.45 for diesel (AGN, October 1), and any MEM price on this page monitored before October 1 does not include the exemption. Both taxes return on January 1, 2027. The separate Decree 21-2026 (Q39/Q41 price caps) was vetoed. Details on Guatemala gas prices today.
Should you use premium, regular, or diesel? Depends on the vehicle, not preference. This page compares the 3 fuels available in Guatemala by cost, efficiency, and application.
Summary: Super only if your manual requires it. Regular for 80% of vehicles. Diesel for trucks, large SUVs, and high-mileage drivers — but note that diesel is now the most expensive of the three fuels, not the cheapest. It overtook regular gasoline in the week of 20 July 2026 after the Decreto 11-2026 subsidy ended. Forcing super into a regular-spec engine is still money down the drain.
Quick comparison
| Fuel | Octane | Price Q/gal (MEM, 26 Oct 2026) | For what vehicle type |
|---|---|---|---|
| Super | 95+ | Q34.49 | High-compression, turbo, premium engines |
| Regular | 87 | Q32.07 | Standard vehicles, most |
| Diesel | N/A | Q42.69 | Diesel engines (trucks, large SUVs, generators) |
MEM-monitored self-service prices for Guatemala City and surrounding areas. Full-service pumps run about Q0.93 more per gallon, and branded grades (V-Power and similar) about Q0.50 above the standard grade. Super runs Q2.42 above regular. Live figure: today’s gas price.
When to use premium
YES use premium if:
- Your owner’s manual explicitly says “Premium” or “95 octane required”
- Your vehicle has a turbo engine (common in BMW, Audi, Mercedes, some Honda Civic Si, etc.)
- Your engine “knocks” with regular on hills (sign of detonation)
- High-end vehicle 2018+
DO NOT use premium if:
- Your manual says “Regular” or “87 octane recommended”
- Standard Toyota, Hyundai, Kia, Nissan vehicle (most use regular)
- Basic sedan model 2010+
Cost of unnecessary super “upgrade”:
- Q2.42/gallon × 15 gallons × 50 fillups/year = Q1,815/year wasted (more if you buy a branded grade, which adds about Q0.50 per gallon on top)
When to use regular
YES regular for most:
- Toyota Corolla, Hilux (gasoline), Yaris, Avanza, RAV4
- Hyundai Tucson, Elantra, Accent, Creta
- Kia Sportage, Picanto, Rio, Cerato
- Nissan Sentra, Versa, Frontier (gasoline)
- Honda Civic standard, City, HR-V
- Chevrolet Onix, Spark, Tracker
- Mitsubishi L200 (gasoline), Outlander
- Suzuki Swift, Vitara
If unsure, check your owner’s manual or the fuel cap — many vehicles have the recommendation printed there.
When to use diesel
YES diesel if your vehicle is:
- Large pickup: Toyota Hilux Diesel, Mitsubishi L200 Diesel, Mazda BT-50, Nissan Frontier Diesel
- Large SUV: Toyota 4Runner Diesel (rare), Land Cruiser Prado Diesel, Mitsubishi Montero
- Commercial truck: any truck > 3 tons
- Bus or microbus
- Electric generator (most residential and commercial generators)
Diesel advantages:
- Efficiency: 25-40% more miles per gallon
- Torque: superior for cargo and mountain driving
- Durability: engine lasts 1.5-2x longer before overhaul
Disadvantages:
- Fuel cost: diesel is now the dearest of the three grades — Q42.69 against Q32.07 for regular at MEM’s 26 October 2026 monitoring, about Q10.62 (33.1%) more per gallon. It used to be the cheapest
- Vehicle initial cost: Q30,000-Q80,000 more than gasoline version
- Maintenance: more expensive (DPF filters, common-rail system)
- Parts availability: harder in rural areas
- Emissions: more NOx and particulates (although modern EURO 5/6 standards control this)
Calculation of when diesel pays off vs gasoline
This calculation changed in July 2026. Diesel carried the largest Decreto 11-2026 subsidy, rose 61% in the five weeks after it ended, and passed regular gasoline in the week of 20 July 2026. The engine is still more efficient, but the fuel is no longer cheaper — a 25-40% efficiency edge now has to absorb a price gap of Q10.62 per gallon (33.1% at MEM’s 26 October 2026 monitoring). At that gap the diesel’s per-kilometre advantage is about -6-5%, instead of the 30-50% that applied when diesel was also the cheap fuel. The purchase premium therefore takes longer to recover than it used to.
For a new vehicle, the rough break-even by annual mileage:
| Kilometers/year | Does diesel pay off? |
|---|---|
| < 10,000 km | NO — the purchase premium is not recovered |
| 10,000-20,000 km | UNLIKELY — the running-cost gap is no longer wide enough |
| 20,000-40,000 km | MAYBE — depends on the model and how long you keep it |
| > 40,000 km | YES — the efficiency edge still adds up at high mileage |
The mileage thresholds are our judgment, not a MEM figure; only the fuel prices behind them are sourced.
Typical efficiency by common model in Guatemala
| Model | Fuel | Km/gallon | Cost Q/100km (MEM, 26 Oct 2026) |
|---|---|---|---|
| Toyota Corolla 2020 | Regular | 35 | Q92 |
| Hyundai Accent | Regular | 38 | Q84 |
| Toyota Hilux Diesel | Diesel | 28 | Q152 |
| Mitsubishi L200 Diesel | Diesel | 26 | Q164 |
| Honda Civic Turbo | Super | 32 | Q108 |
| Nissan Frontier Gasoline | Regular | 22 | Q146 |
| Toyota Land Cruiser Prado | Diesel | 18 | Q237 |
Costs use MEM’s self-service prices for Guatemala City as monitored on 26 October 2026 (Regular Q32.07, Super Q34.49, Diesel Q42.69). The km/gallon column is a typical-consumption estimate, not a MEM or manufacturer figure — only the prices are sourced.
Common mistakes
- Putting super in a regular-spec engine — pure money waste, Q2.42 per gallon for nothing
- Putting regular in premium-required engine — damages engine medium-term (knock, sensors)
- Mixing diesel with gasoline — catastrophic engine damage (NOT REVERSIBLE)
- Buying diesel for short urban use — diesel engines need to warm up, trips < 15 min damage DPF system
Related
- Today’s Gas Price — current national prices
- Price History — the 2026 subsidy and the jump after it ended
- Price by Department — regional variation
- Cost to Fill Tank — by model
- Exchange Rate — affects fuel price
Frequently Asked Questions
Should I use premium instead of regular?
Only if your vehicle requires it (high-compression engine, usually turbo or premium vehicles). For vehicles designed for regular, using super does NOT improve performance — you simply pay the super premium for nothing. The current gap per gallon is in the quick-comparison table on this page, which renders from MEM’s latest monitoring. Branded grades such as V-Power add about Q0.50 on top of that. Check your owner’s manual.
Is diesel really more efficient?
The engine still is, but the fuel is no longer cheap. Diesel engines typically deliver 25-40% more miles per gallon than equivalent gasoline engines. Diesel used to cost less per gallon than regular; it does not any more — it carried the largest Decreto 11-2026 subsidy and rose furthest when that ended in July 2026, passing regular in the week of 20 July. Whether a diesel is still cheaper per kilometre now depends on two numbers: the engine’s 25-40% efficiency edge, and the price gap per gallon, which moves every week. Both are priced out against MEM’s current monitoring in the cost table on this page.
Why are so many trucks and SUVs diesel?
Three reasons: (1) higher torque at low RPMs (better for cargo and mountains), (2) superior efficiency under heavy use, (3) greater engine durability (diesels typically last 1.5-2x longer than gasoline before major maintenance).
Is there premium diesel in Guatemala?
Yes — branded diesel grades such as V-Power Diesel are sold alongside standard diesel, and branded grades run about Q0.50 per gallon above the standard grade. For normal use NOT worth it; for modern vehicles with DPF (particulate filter) systems or high-pressure common-rail engines it can extend engine life.
