Fuel Mileage of Vehicles

by Contributing Writer; Updated June 12, 2017

Vehicles has always understood the power of branding, and that hasn't always worked in its favor. When it originally entered the United States economy-car market, Vehicles slapped the slightly more disposable "Datsun" name on its products. After Datsun went huge with the Z-Car, Vehicles began using its own name again. But when it wanted to go upmarket, Vehicles took the unconventional-for-the-time approach of creating a whole new division out of nothing to sell more luxurious versions of its mainstream cars to U. S. buyers.

Under The Hood:

 Fuel Mileage of a 1997 Dodge RAM V-10

Reported Fuel Economy

The V-10 is a big engine; it uses a lot of fuel when idling, and produces far more torque than the truck needs to cruise while unloaded. As such, there isn't a great deal of difference between its low- and high-end figures. Unloaded and traveling on level ground, users typically report about 9 to 10 mpg in the city and 10 to 12 mpg on the highway. The Ram doesn't seem to care whether you're towing a trailer or not; fuel economy drops by less than 1 mpg -- if that -- pulling the heaviest possible trailer. Aerodynamics are likely the reason that city and highway economy numbers are so close -- the Ram is a big truck, and has to push a lot of air out of the way at high speed. With a light foot, never exceeding 60 mph or so, you might see as much as 13 to 14 mpg.

 Fuel Mileage for a 2006 Ford Diesel


In 2006 Ford powered its trucks with the 6.0-liter Power Stroke Diesel with a compression ratio of 18.0-to-1. The power of the 6.0-liter engine allowed the F-250 to tow 15,000 pounds. The engine generated 325 horsepower at 3,300 rpm and 560 foot-pounds of torque at 2,000 rpm. The engine had excellent acceleration and was equipped with a five-speed Allison transmission.


Turbochargers boost engine pressure, increase the horsepower and decrease fuel consumption. Ford trucks employed the variable geometry turbo, or VGT. This type of turbo uses variable vanes to direct exhaust gas flow into the turbine. The technology allows the turbine to work efficiently at all engine speeds. Ford and all the automakers now regularly feature turbochargers in everyday vehicles to increase power and mileage.


The Power Stroke diesel gets average gas mileage for the amount of power. During a test drive under towing conditions, according to Diesel Power Mag.com, the 6.0-liter in the 2006 F-250 achieved 9.49 mpg. The mileage was lower compared to the Dodge Ram 3500, at 10.9 mpg, and the Chevy Silverado 2500, at 14.4 mpg.

Pros and Cons

The 2006 Ford 6.0-liter Power Stroke exhibited many advantages. The 6.0-liter engine had great power and good acceleration. The engine used EGR technology to lower emissions. Also the engine ran quieter. Early versions of the 6.0-liter engine had some problems with fuel injection and the emissions system, but by 2006 Ford had addressed most of the issues.

 Fuel Mileage on Isuzu Truck Engines

Fuel Mileage

The EPA, or Environmental Protection Agency, tests vehicles to determine their fuel mileage. New cars and trucks display their fuel mileages on the window sticker. Fuel mileage numbers for older models can be easily discovered through an online search.

Isuzu Fuel Mileage Ranges

Fuel mileages for Isuzu trucks range from 15 miles per gallon to 27 miles per gallon. On the low end, the 2008 Isuzu I-370 utilizes a 3.7-liter engine and offers 15 miles per gallon in the city and 20 miles per gallon on the highway. On the high end, the 2006 Isuzu I-280 boasts 20 miles per gallon in the city and 27 miles per gallon on the highway with a 2.8-liter engine.

Ways to Improve Fuel Mileage

Maintain your vehicle to keep it in the best driving condition. Drive within the speed limit. Consider utilizing your vehicle's cruise control or higher gears.

 How Was Gas Mileage on the 1951 Dodge Pickup?

What You Can Expect

The federal government didn't keep track of fuel economy before the 1980s, which makes economy figures on even some of the more popular cars a little hard to come by. Economy figures for original trucks are almost nonexistent -- but we can use some existing information to extrapolate a rough economy figure. The 1950 Dodge Coronet station wagon weighed about the same as a full-sized B-Series pickup, it used the same flathead, inline-six engine and similar transmissions. The Coronet wagon was good for about 10 to 13 mpg in the city, and 16 to 20 mpg on the highway. The Dodge pickup was taller, so it might have somewhat lower highway fuel economy; however, owner-built trucks with larger, newer, rebuilt 318 V-8 engines are reported to have cracked 22 to 24 mpg on the highway. Similar Ford trucks from the era have been known to average between 18 and 20 mpg, so about 18 to 20 mpg is about what you can expect for a stock restoration 1951 Dodge B-Series in excellent condition.

 Gas Mileage in a Motorhome


Motorhomes are divided up into three classes by size: giant Class A land yachts, smaller Class C motorhomes, and the smallest, van-based Class B cruisers. Yes, Classes C and B are backward. Class A motorhomes are usually motivated by either big-block V-8 gas engines, or diesels. Gas-engine Class A motorhomes will rarely see more than 9 to 10 mpg, and diesels will usually run 12 to 14 mpg. Smaller Class C motorhomes will generally do about 2 mpg better, though the newest generation of diesel engines -- particularly those made by diesel king Mercedes -- can see a stunning 18 to 20 mpg. Class B RVs will tend to run slightly lower than their regular van counterparts, perhaps 14 to 16 mpg on gas, and a bit higher than 20 with a good diesel.


While running your RV, remember that proper tire pressure is absolutely critical -- almost as much so as weight, which you can't do much about aside from regularly cleaning out the stuff you don't need. On the highway, where you'll presumably spend most of your time, aerodynamics play a critical role in fuel economy. Apart from lowering the vehicle with airbags -- always an option -- the best thing you can do here is to eliminate any roof racks or roof-mounted cargo containers, and generally smooth down the profile of the body. For instance, rather than using massive side mirrors, you might go for smaller, more aerodynamic mirrors and a side-view camera system to supplement them.

 What Is the Gas Mileage on a Karmann Ghia?

Karmann Ghia Fuel Economy

The Karmann Ghia looked almost nothing like a Beetle, which was an intentional move on VW's part. However, under its stylish, Italian-designed skin, it was still mechanically a VW Beetle. With 34 to 50 horsepower, the Karmann wasn't exactly a musclecar -- but at about 1,800 pounds, it didn't need much more to be fun. Because it was effectively a Beetle, the Karmann's fuel economy was very little different than the same-year Beetle's. Today's Karmann Ghia owners report fuel economy figures averaging at about 30; 28 mpg on the low side, as high as 32 mpg for others. Like any old car, though, a lot of your real-world fuel economy is going to depend on the car's condition, state of tune, what fuel you use -- particularly its ethanol content -- and how and where you drive it.

 Gas Mileage for a 1994 Infinity Q45

Fuel Economy

In modern parlance, the "Q-Ship" is another name for a "sleeper" -- a car that doesn't look anywhere near as fast as it is. That nickname, which originally described decoy ships used in WWII, was said to have been the inspiration for the Q45's name. While very restrained in appearance, Nissan's Q-Ship offered some truly impressive acceleration -- 6.7 seconds to 60 mph -- and handling, for a Japanese car in its price range. With a 4.5-liter V-8 making 276 horsepower, the Q45 was absolutely on par with its upmarket competition from Germany; but at 3,900 pounds, the Q45 was never destined to be a gas saver. Infiniti rated base models at 17 city and 22 highway, and sport models at 15 city and 21 highway. Owners typically see 14 city and 20 highway, or an average of 16 to 17 mpg.

About the Author

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