How do tyres affect fuel efficiency? 

That's what I thought too!

I spent longer than I'd care to admit wondering if it would rock back and forth like a boat at sea!!

Very true. 👍

Us nerds need to stick together 😂😂

Our pleasure!

Can't wait to see the relative differences of Cybertruck tire mountings. P.S. Condolences for NACS standardization having (heaven?) taken so long, though you'll be grateful for the results. After all, can anyone recall the number of petrol nozzles during the advent of ICE engines?

Thx for the great analysis! Can't wait to see the relative differences of Cybertruck tire mountings. Testing with FSD should help normalize results, considerably. P.S. Condolences for NACS standardization having (heaven?) taken so long, though all'll be grateful for the results. After all, can anyone recall the number of petrol nozzles during the advent of ICE engines? When might non-NACS plugs be seen only in museums? '27?

Glad you enjoyed it. 👍👍😀

Now THAT would be a cool project. 😎👍

I thoroughly recommend the Trail Terrains. Maybe try them. 👍

The Land Rover tank. 😉👍

@@ElectricClassicCars You gotta do one some day and then do serious off-road test... Would look quite funny because you need so much height to install proper tracks...

Glad you enjoyed

Thanks 👍😀

Absolutely. I also would like to know if the truck's computer has the ability to change/set tire/tyre circumference so speed and distance can be equalized. It appears that the weight of the tires goes down from a ton to a respectable amount for the highway tire. The additional weight of the monster tires with monster wheels could easily have added a couple hundred pounds to the load. All of this affects the efficiency of the truck and any truck or car they go on.

@@robeigner4390 I appologise first as this is a long comment. Without knowing the tyre sizes I can't give exact figures for weight, but looking at the overall height of all 4 tyres, the mud-terrain tyres look taller, so in effect at 55mph (sat nav speed) there would be less revoloutions of the tyre per mile compared to the other 3 tyres. This effectively means the motor would not be used as much. Saying that, the chunky tyre takes more energy to turn as the sidewall height is bigger, meaning there is more resistance within the tyre (internal friction) to rotate it & the tread design itself also increases the rolling resistance, as I expalin later. Compare that to the Michelin SUV tyre, which is designed to have less friction within the tyres construction and the 18 inch wheel reduces the sidewall height compared to the (very similar) overall height of the all-terrain & trail-terrain tyres, which are on 16 inch rims (resulting in a slightly taller sidewall). The other significant benefit of the SUV tyre is the tread pattern itself, It is designed to offer lower rolling resistance because there are continuous strips of rubber going around the cicumference of the tyres that reduces the rolling resistance as the tyre tread is always in contact with the road. With a 'block pattern tread' (the other 3 tyres) every time a block of rubber hits the road, the block effectively tries to stop the wheel turning, which dependant on the severity of the block, increases the energy required to turn the tyre (i.e. the rolling resistance) As for the unsprung weight of the tyre, yes this will impact on the economy too as the power unit has to use more energy to turn the wheels. In essence, the mud-terrain tyre has everything against it. It has large rubber blocks which act as a brake every time one comes in contact with the road, there's extra rubber used in the constuction of the tyre (heavier), the sidewall height is bigger and thicker to reduce punctures (again increasing weight & friction), all of which increases the weight & internal friction of the tyre reducing the rolling resistance. Compare this to the SUV tyre, which has continuous tread in contact with the road, thinner & smaller height sidewalls, all of which, adds up to a lighter tyre/wheel with lower rolling resistance resulting in a vastly improved road handling and fuel efficient tyre. As for the all-terrain & trail-terrain tyres, they have varying combinations of the above designs, so it shouldn't come as a surprise why they fall into their respective positions in the overall result.

Can't wait to see the relative differences of Cybertruck tire mountings. Testing with FSD should help normalize results, considerably. P.S. Condolences for NACS standardization having (heaven?) taken so long, though you'll be grateful for the results. After all, can anyone recall the number of petrol nozzles during the advent of ICE engines? When might non-NACS plugs be seen only in museums? '27?

Our pleasure!

You still need to output the same energy - the efficiency of the engine doesn’t go up at higher power level.

@@JohnR31415Actually the efficiency of an internal combustion engine varies substantially with power output. Generally the efficiency goes up with load (to a point). When you hear people say engines are 30% efficient, that’s at peak efficiency. Elsewhere in the power curve it can be as low as 10% - which is where it will be most of the time if you’re driving in traffic. Engineering Explained did a great video about this: “The best way to compare engine efficiency: BSFC”

@@JohnR31415Actually the efficiency of an internal combustion engine varies substantially with power output. Generally the efficiency goes up with load (to a point). When you hear people say engines are 30% efficient, that’s at peak efficiency. Elsewhere in the power curve it can be as low as 10% - which is where it will be most of the time if you’re driving in traffic. Engineering Explained did a great video about this: “The best way to compare engine efficiency: BSFC”

Thanks. 👍👍

Thanks. We were very interested to discover the results ourselves. 👍

Hey, thanks

Thanks 👍👍

I bet those guys with the V8 trucks and huge off road tyres are the first to complain when gas prices go up. 😆😉👍

I have a few coworkers in here in Canada who live on acreages on paved access roads who drive SUVs with off-road tyres & spend $25 per day on gas to get to & from work in the city. It's not about good decision-making so much as the vehicle is a giant security blanket. Apparently a Vietnamese EV company is building a factory in the US which will produce sub-$20,000 EVs with a 248-mile range starting in 2025 or 2026. This may explain why Tesla has been dropping prices.

@@ElectricClassicCars Usually the gas guzzler drivers blame fuel efficient vehicles for the increase in gas prices. I'm not sure they understand supply & demand.

Maybe a summer off road tyre test. 👍😀

Thanks 👍😀

👍👍

No, it affects the torque required, which is not an issue as the vehicle has plenty spare. I accept that the more variables that are fixed the better the comparison but manufacturers are fitting larger and larger wheels to cars and it's not to make them less efficient.

@@DrRogB Mostly disagree. Whilst electric powertrains have a linear torque curve, larger wheels effectively use more energy to spin up to an equivalent speed. If torque was the only factor involved with efficiency (energy for a given velocity) then the tread and tyre depth would not affect the efficiency…..But that is clearly not the case here as the tests proved. Those three equal diameter wheels run on the same drivetrain torque showed significant efficiency differences. Again if the torque was the deciding factor in energy use the efficiencies would have all been equal.

We mentioned tyre pressure was the same. It was raining a little all day and night. The LED lights would have had no impact as their amp draw is so low.

No, those microphones often pick up minor noises and amplifies them.

You are correct. 👍

Glad we could help. 👍😀

We were definitely impressed with the Trail Terrains. 👍

and the overloading of the van was for BURNING MAN !!! - where I live in the alternative Energy Zone - with 2 solar generators ( the lithium one is worthless for the Burn) the ultimate solar garden light ( looks for all the world like a victorian cast iron street lamp , 7 ft tall) a solar cooker ( no fuel, no fumes) and a. composting toilet - that at the burn I can sit on in the back of my truck and watch the world go by!

Good idea. We should have measured that. 👍😀

They all weigh about the same except the Trepadors which weigh a ton. 👍

Weather was pretty much the same all day. It was a bit cooler in the evening but not by much. Wind was the same.

North of £100,000

Thanks. I got a C in GCSE English, can you tell. 😆😉👍

Wouldn't economy be worse at night with colder damp air being more dense? If so then the differences are even more extreme.

@@alibro7512 Yup, colder conditions should increase aerodynamic drag, no doubt. However, I would assume for this kind of beast rolling resistance probably uses the greater portion of total power needed to average 55mph, than the aerodynamic drag does ... so it shouldn't influence the result much

Rumble strips on the road coming up to the roundabout.

It's a wonder they don't make a noise then.

Huh?

It really but we hope to do a feature on eco tyres soon. 👍😀

Good question. We hope to be testing such a tyre soon. 👍😀

Track day comparison between electric and petrol Testarossa is soon. 😎😉👍

@@ElectricClassicCars not Elon time of 2 weeks could end up meaning 200+ days or 2 years soon though right? 😀

Thanks 👍👍

Nope. 😉👍

Apparently noise equals soul, or so I’ve been told. 😆😉👍

Noise is for the blind or poor-sighted pedestrians to know that car is coming fast... That is why police cars, ambulances and fire engines here get so many complains and tickets, because they go over speed limits without using siren.

I agree. But just like stiletto heels 👠 they’re not the most comfortable or easiest to live with every day. 😆😉👍

@@ElectricClassicCars that’s also true. How do you avoid your big wheels from ‘shaking’ when driving fast? I have Toyo Open M/T 255/85/16 on my 110 and when I hit 80 km/h the front wheels start shaking and the after 85 km/h it stops. Does it all have to do with the balancing? Thanks for your content, still saving up money to go electric on my 110 😂

Have you been wearing stiletto heels again ? 👗

@@jonasschnackkrogWheel balancing is essential. The bigger the off road tyre the more weights are required. However, I’ve noticed they can easily drop off, the tyres can rotate on the rims and mud collecting in the grip all can cause wobble. 👍

In addition: PLEASE note that this is NOT Fuel consumption! This does NOT = the saving in FUEL! Because the most important factor at 80km/h is aerodynamics. Leaving the roof rack at home will probably safe more fuel, when you go highway speeds; and not shppping with your 4x4.

This is why All tyres are compared to the Maxxis. The difference between tyres 2 and 3 was not shown, only the difference between 1 and 2 and between 1 and 3. How is this not a measure of fuel consumption? Energy used to turn the wheels was the thing being measured aka energy consumed. The aerodynamic profile of the vehicle was kept constant, no change in energy would be shown if tyre choice made no difference compared to aerodynamics.

That’s correct. 👍

"How is this not a measure of fuel consumption? " Because, as I mentioned, the aerodynamics plays a SOOOO much bigger role on highway, that this is almost irrelevant. On highway (according to a German Car Lobby, ADAC) 70% of fuel consumption is caused by aero. 19% roll resistance. But Note: roll resistance is NOT only caused by tire profile but MOSTLY by tire air pressure. Plus width and diameter plus weight of the tire. A 33" MT with 5 bar is probably WAY BETTER than a 35" street with 3,5bar. So the profile ITSELF is just a FRACTION of 19% and within this fraction you can save the mentioned 20%-37%. = you cannot even measure the difference in highway in fuel@@watcher24601

it´s math.