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How Can We Get Better Fuel Mileage and More Car Questions From You Under The Hood

How Can We Get Better Fuel Mileage and More Car Questions From You Under The Hood

Under The Hood show Mar 05, 2026 55 min
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About this episode

Fuel economy concerns take center stage as callers seek advice on improving mileage and understanding vehicle performance. A Ram 2500 owner learns that his 10-13 mpg is typical for a heavy-duty truck, with driving speed and conditions playing major roles. Another caller with a 2016 Equinox is reassured that regular maintenance like spark plug replacement and fuel system cleaning can help maintain efficiency. The hosts also debunk myths about fuel additives and chips, emphasizing realistic expectations and practical driving habits. The episode blends technical insights with relatable stories, making fuel economy a down-to-earth topic.

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Technical Too Afraid to Ask
Car

Ram 2500

"I've got a 2024 Ram 2500. And to get a terrible gas mileage on it. I just purchased this. So it came off of a lease."

The Ram 2500 is a big pickup truck that can carry and pull heavy loads. The 2024 version is the newest one with updated technology and engines.

Car

Renault Wind

"...per gallon in a truck because of the RPM and the wind, the faster you go, imagine holding up a piece o..."

The Renault Wind is a small car with a roof that can open, making it fun to drive. People talk about how wind can affect how much gas it uses when driving fast.

Car

Chevrolet Silverado

"...re they get up to 16. So I thought 10.9. I have a Silverado 1500 that if you look online says you're going t..."

The Chevrolet Silverado is a big truck that many people use to carry heavy things or drive on rough roads. People talk about it because it can pull heavy loads and is good for many jobs.

Term

plug-in chips

"Do you have any recommendations on these plug-in chips I'll call them, which claim to give you better gas mileage, better horsepower? It's going to be super minor. It'll give you a little more horsepower and torque, but not miles per gallon because you're going to trade off that half to one mile per gallon again."

Plug-in chips are small gadgets you can add to your car to try to make it faster or use less gas. But usually, they only help a little bit and might need you to use more expensive fuel.

Part

spark plugs

"I'm guessing. It's probably time at some point to put spark plugs in there. That was the thing I thought it was spark plugs."

Spark plugs help your car's engine start and run by making tiny sparks. Over time, they wear out and need to be changed so your car runs smoothly.

Part

spark plug wires

"At that time, they might recommend some new spark plug wires to go on there and possibly the coils."

Spark plug wires send electricity to the spark plugs so they can make sparks. If the wires get old, your car might run badly and need new ones.

Concept

fuel system cleaning

"No reason to spend that money. Fuel system cleaning. Yeah. They might recommend a fuel system cleaning and spark plugs."

Fuel system cleaning is a process that cleans parts of your car that use gas to help it run better and save fuel.

Part

oxygen sensors

"put oxygen sensors we call them in there for no reason. I don't think in that vehicle, if you don't have any problems or any codes."

Oxygen sensors check how much air is in the car's exhaust to help the engine run better and keep pollution low.

Car

BMW E88

"...ton of E15 in use on a regular basis when it says E88 on the pumps. And so Russ and I have both had ve..."

The BMW 1 Series is a small, fancy car that is fun to drive. Some people use a type of gas with more alcohol in it, which can be tricky for the car.

Car

BMW E30

"...Russ and I have both had vehicles that we've used E30 in on a regular basis. But they require premium ..."

The BMW 3 Series is a fancy car that is fun to drive and has nice features inside. It usually needs special, more expensive gas to run well.

Term

E85

"Do not use the E85. Right. Do not use the E85 unless it's a flex fuel and it has a yellow gas cap or has some indication by the VIN number. It's a flex fuel."

E85 is a special kind of gas that has a lot of alcohol in it. Only certain cars made for it can use it safely.

Term

flex fuel

"Do not use the E85 unless it's a flex fuel and it has a yellow gas cap or has some indication by the VIN number. It's a flex fuel."

Flex fuel cars can use regular gas or special gas with more alcohol in it. They are made to work with both.

Term

yellow gas cap

"Do not use the E85 unless it's a flex fuel and it has a yellow gas cap or has some indication by the VIN number."

If your car's gas cap is yellow, it means it can use special gas with more alcohol safely.

Car

Ford F-250

"Hey guys, I got a 2015 Ford F-250 and it's the 6.7 power stroke."

The Ford F-250 is a big truck used for heavy jobs. The 2015 version can have a strong diesel engine called the 6.7 Power Stroke that helps it pull heavy loads.

Part

6.7 Power Stroke

"Hey guys, I got a 2015 Ford F-250 and it's the 6.7 power stroke."

The 6.7 Power Stroke is a strong diesel engine that helps big trucks like the Ford F-250 pull heavy things. It uses special parts to make a lot of power and run efficiently.

Term

compression test

"So I was wondering, is there any way to check that cylinder for compression on there? There is. You can pull the glow plug out and use a tester that goes in that hole in order to test the compression. You need a special adapter with the compression gauge and the compression gauge is capable of going to the PSI that it's supposed to have. But you can check compression that way we do that."

A compression test checks how strong the engine's cylinders are by measuring the pressure inside them. This helps find out if parts inside the engine are worn out or broken.

Part

glow plug

"There is. You can pull the glow plug out and use a tester that goes in that hole in order to test the compression."

Glow plugs help diesel engines start when it's cold by warming up the engine. You can take them out to check how strong the engine's cylinders are.

Concept

salvage units

"But you can check compression that way we do that. We do it on our salvage units that we dismantle."

Salvage units are cars or trucks that got damaged and are taken apart to use their parts. Checking the engine's strength helps decide if parts are still good to use.

Concept

low sulfur diesel fuel

"Because of the low sulfur content, you're going to wear parts out. Our partner at Hot Shot Secret sells an everyday diesel treat, the EDT,"

Diesel fuel with less sulfur is better for the environment but can make engine parts wear out faster unless you add special liquids to protect them.

Company

Hot Shot Secret

"Our partner at Hot Shot Secret sells an everyday diesel treat, the EDT, that's good to run in there."

Hot Shot Secret makes special liquids you add to diesel fuel to help keep engines clean and working well.

Term

EDT (Everyday Diesel Treat)

"Our partner at Hot Shot Secret sells an everyday diesel treat, the EDT, that's good to run in there. It'll provide the lubricity and also help cleaning it out."

EDT is a liquid you add to diesel fuel to help keep the engine parts clean and stop them from wearing out.

Term

emission system cleaning

"You might perform an emission system cleaning on it to see if that cleans it up. One of the first steps that shops will do if they're trying to diagnose this type of thing is a cleaning."

Emission system cleaning is like giving your car's exhaust parts a good wash to help it run cleaner and pollute less. It can fix problems caused by dirty parts.

Part

injector

"Because let's say it needs an injector. They're going to clean all the injectors and then they're going to put a new one in that cylinder because they want the others to be just as clean as a new one."

An injector is a small part that squirts gas into the engine so it can run. If it gets dirty, the car might not work well.

Company

Hot Shot's Secret

"you say you put the hot shots in there and you got yourself where the light went away. That's highly encouraging. ... So I did and like I said, within 30 miles, the light went off ... when it took that light away, I'm like, okay, obviously there's something to it."

Hot Shot's Secret makes special liquids you add to your car's fuel to help it run better and stop warning lights. People use it to fix problems without going to a mechanic.

Term

OEM wheels

"New OEM wheels can be expensive with some wheels that cost 500 or more from the dealer."

OEM wheels are the wheels that come with your car when it's new. They usually fit perfectly but can cost more than other wheels you can buy.

Term

TPMS sensors

"Use your factory TPMS sensors and caps too. Go to roadreadywheels.com to find out more."

TPMS sensors are little devices in your tires that tell you if your tires don't have enough air. This helps keep you safe while driving.

Concept

car-part.com

"If you need parts, whether it be for a brand new car or going back about 20 years, it doesn't matter, check out car-part.com. It's fast and it's easy. Over 200 million parts strong all across North America. Over 4,000 recyclers to choose from, giving you the largest selection available."

Car-part.com is a website where you can find used car parts from many different sellers. It helps you get parts for your car, even if it's an older one.

Car

Nissan Frontier

"... y'all show man. I got a 2007 B64.0 little Nissan Frontier. I got a couple of questions on it. Oh, the firs..."

The Nissan Frontier is a smaller truck that is good for everyday work and doesn't cost too much. Older ones might need some extra care to keep running well.

Term

ABS light

""Oh yeah, I'm having issues with the idle a little bit and an ABS light, I can't get to this fear. The ABS light didn't change any with the wheel hubs because sometimes that can be a problem because there's sensors up there.""

The ABS light is a warning on your car's dashboard that tells you if the anti-lock brakes might not be working properly. Anti-lock brakes help keep your car from sliding when you brake hard.

Part

wheel hubs

""The ABS light didn't change any with the wheel hubs because sometimes that can be a problem because there's sensors up there.""

Wheel hubs are the parts in the middle of your wheels that hold them onto the car. They also have sensors that help the car know how fast each wheel is turning.

Term

ABS sensors

""because there's sensors up there. I thought it would, but it didn't. Have you put a scan on it to see where that ABS light is, you know, what's, where it's coming from that you can get a little more detail with the right scanner?""

ABS sensors are small parts that check how fast your wheels are spinning. They help the car stop safely without the wheels locking up.

Concept

EV write-offs

"Well, I just, I said breaking news, but as we record live at the break, I looked over my phone and I had a notification from LinkedIn. And now we've seen the third of the big, what we would call the big three report their EV write-offs."

When a car company spends money on electric cars but things don't go well, they have to count that money as lost. That's called an EV write-off.

Brand

Stellantis

"Stellantis posts its first annual loss ever on EV charges. Let's get ready for this one. Okay. So, Stellantis on Thursday delivered its first ever yearly loss..."

Stellantis is a big car company that owns brands like Jeep and Dodge. They make many different cars and trucks.

Concept

electric vehicles (EVs)

"The auto giant in charge of Jeep, Dodge and Chrysler reported a net loss of $26.3 billion in 2025 after posting a profit of roughly $6 billion a year earlier. Most of those write-downs traced to its failed EV program..."

Electric vehicles are cars that run on electricity instead of gas. They use big batteries to move.

Car

Jeep Wrangler

"...tis sees hybrids including the best-selling Jeep Wrangler 4XE as a path forward and I see they're even elim..."

The Jeep Wrangler is a tough car that can drive on rough paths and is good for outdoor adventures. There's a new version that uses both gas and electricity to save fuel.

Car

Ford F-150 Lightning

"... we're, and they started doing some electric. The lightning was developed, all that. And now in the meantime..."

The Ford F-150 Lightning is a big truck that runs on electricity instead of gas. It can do the same jobs as regular trucks but is better for the environment.

Brand

Tesla

"Tesla, who was just chugging along and slowly increasing this whole time, but steadily and still the electric giant is now taken over"

Tesla is a company that makes electric cars, which run on batteries instead of gas. They are very popular and helped make electric cars mainstream.

Car

Chevrolet Bolts

"...e things might go hand in hand. We're dismantling Chevrolet bolts, a number of those for parts. And the batteries ..."

The Chevrolet Bolt is a small car that runs only on electricity, so it doesn't use gas. People talk about its battery because it needs to be taken care of to keep the car working.

Concept

hybrid battery technology

"And the hybrids, they gained knowledge on the hybrid battery technology."

Hybrid cars use both gas and electric batteries to help save fuel. The battery technology helps the car go farther and use less gas.

Car

Toyota T100

"...we've upgraded the fleet slightly from the Toyota T100s. As soon as you start looking it is amazing how ..."

The Toyota T100 is an older big truck that many people liked because it was simple and worked well. Some people replace it with newer trucks that have more modern features.

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