Average Gas Engine Specific Output Isn't Quite 100 HP/L, Yet

Mark Stevenson
by Mark Stevenson

It was nearly 15 years ago that Honda was touting their magic number — 118.5 hp/L. This was the specific output for the U.S.-spec Honda S2000 powered by a high-strung, 237-horsepower, 2-liter engine and it was a marvel of engineering, trumping the Viper and many other more expensive machines.

Fast forward to today and there are only a few naturally aspirated vehicles that top Honda’s claim to fame, but many that easily beat it with some form of forced induction. Yet, even with this plethora of new high-output, small-displacement engines, the average specific output of gasoline and flex fuel vehicles in the United States is still below the record set by Honda back in 1999.

Thanks to data provided by iSeeCars, we came up with some interesting data when it comes to specific output for 2015 model year vehicles.

For one, the Mercedes-AMG CLA45 (pictured above) and the GLA45 with which it shares its turbocharged, 2-liter, four-cylinder engine are the top performers with specific outputs of 177.5 hp/L. It should be no surprise that turbocharged engines dominate the top 100 engines ranked by specific output, but there are some exceptions. The top naturally aspirated mill in the mix — the 597-hp, 4.5-liter V-8 in the Ferrari 458 Speciale — has a specific output of 132.7 hp/L. Porsche’s 911 GT3 is solidly mid-pack with 125 hp/L.

On the other end of the scale, trucks score quite low on the specific output meter, as the Ford F-350 equipped with a 316-hp, 6.2-liter V-8 struggles to make 51 hp/L. The lower output may not be representative of a behind-the-times engine, but rather it could be characteristic of their applications. Trucks need torque more than horsepower to do the work they were built to do.

Overall, the average for specific output for non-hybrid, gasoline and flex fuel engines sits at 93.3 hp/L, just 25.2 hp/L shy of the naturally aspirated benchmark set by the Honda S2000. However, as more automakers downsize their engines and boost output with turbocharging, we may just see the overall average crest this high-water mark in the coming years.

Below is a list of the top and bottom 10 vehicles available on the retail market for the 2015 model year ranked by specific output.

Top 10

  1. Mercedes-AMG CLA45/GLA45


    2-liter turbocharged I-4, 355 horsepower


    177.5 hp/L
  2. McLaren 650S Coupe/Spider


    3.8-liter twin-turbocharged V-8, 641 horsepower


    168.7 hp/L
  3. Nissan GT-R NISMO


    3.8-liter twin-turbocharged V-6, 600 horsepower


    157.9 hp/L
  4. Volvo S60/XC60


    2-liter twincharged I-4, 302 horsepower


    151.0 hp/L
  5. Porsche 911 Turbo S


    3.8-liter twin-turbocharged H-6, 560 horsepower


    147.4 hp/L
  6. Audi S3/Volkswagen Golf R


    2-liter turbocharged I-4, 292 horsepower


    146.0 hp/L
  7. Mitsubishi Lancer Evolution


    2-liter turbocharged I-4, 291 horsepower


    145.5 hp/L
  8. Nissan GT-R


    3.8-liter twin-turbocharged V-6, 545 horsepower


    143.4 hp/L
  9. Bentley Continental GT3-R


    4-liter twin-turbocharged V-8, 572 horsepower


    143 hp/L
  10. Ferrari California T


    3.9-liter twin-turbocharged V-8, 553 horsepower


    141.8 hp/L

Bottom 10

  1. Ford F-350 Super Duty


    6.2-liter V-8, 316 horsepower


    51.0 hp/L
  2. Chevrolet Silverado/GMC Sierra 3500HD


    6-liter V-8, 322 horsepower


    53.7 hp/L
  3. Nissan Titan/NV Cargo/NV Passenger/Armada


    5.6-liter V-8, 317 horsepower


    56.6 hp/L
  4. Chevrolet Express/GMC Savana (Cargo/Passenger/Cutaway)


    6-liter V-8, 342 horsepower


    57.0 hp/L
  5. Volkswagen Jetta


    2-liter I-4, 115 horsepower


    57.5 hp/L
  6. Ram Chassis 3500


    6.4-liter V-8, 370 horsepower


    57.8 hp/L
  7. Toyota Tacoma


    2.7-liter I-4, 159 horsepower


    58.9 hp/L
  8. Toyota Tacoma


    4-liter V-6, 236 horsepower


    59.0 hp/L
  9. Chevrolet Express/GMC Savana (Cargo/Passenger/Cutaway)


    4.8-liter V-8, 285 horsepower


    59.4 hp/L


  10. Chevrolet Silverado/GMC Sierra 2500HD/3500HD


    6-liter V-8, 360 horsepower


    60.0 hp/L
Mark Stevenson
Mark Stevenson

More by Mark Stevenson

Comments
Join the conversation
2 of 72 comments
  • Ktm Ktm on Jul 28, 2015

    Yeah, this is a useless metric. All one needs to do is look at 600/1000cc sport bikes to see that they rule the n/a HP/L roost and make car engines look silly.

  • Orenwolf Orenwolf on Jul 30, 2015

    My RX8 handily beats those numbers with its' 1.3L engine. ;)

  • CanadaCraig You can just imagine how quickly the tires are going to wear out on a 5,800 lbs AWD 2024 Dodge Charger.
  • Luke42 I tried FSD for a month in December 2022 on my Model Y and wasn’t impressed.The building-blocks were amazing but sum of the all of those amazing parts was about as useful as Honda Sensing in terms of reducing the driver’s workload.I have a list of fixes I need to see in Autopilot before I blow another $200 renting FSD. But I will try it for free for a month.I would love it if FSD v12 lived up to the hype and my mind were changed. But I have no reason to believe I might be wrong at this point, based on the reviews I’ve read so far. [shrug]. I’m sure I’ll have more to say about it once I get to test it.
  • FormerFF We bought three new and one used car last year, so we won't be visiting any showrooms this year unless a meteor hits one of them. Sorry to hear that Mini has terminated the manual transmission, a Mini could be a fun car to drive with a stick.It appears that 2025 is going to see a significant decrease in the number of models that can be had with a stick. The used car we bought is a Mk 7 GTI with a six speed manual, and my younger daughter and I are enjoying it quite a lot. We'll be hanging on to it for many years.
  • Oberkanone Where is the value here? Magna is assembling the vehicles. The IP is not novel. Just buy the IP at bankruptcy stage for next to nothing.
  • Jalop1991 what, no Turbo trim?
Next