[Richard's Lightning]

Three weeks with a Lariat and the extended battery pack. Added a 2" levelling kit and replaced OEM 275 60 R20 General Grabbers with LT 295 60 R20 Falken Wildpeaks. Mounted them on the OEM wheels. Lost 60 miles of range. Can the coefficient of rolling resistance be that much higher on the Falkens to do that ?

 

[ChasingCoral]

How did you calculate the change in range?

 

[Richard's Lightning]

When charging to 90% before the lift I was getting about 264 miles of range. With no change in driving habits my range has dropped to about 208 miles. I viewed an almost identical conversion done by TC Custom on YouTube and they lost only about 30 miles in a road test. Also it seems with every charge I am losing more. Sure like the looks of the truck though.

 

[John K.]

When charging to 90% before the lift I was getting about 264 miles of range. With no change in driving habits my range has dropped to about 208 miles. I viewed an almost identical conversion done by TC Custom on YouTube and they lost only about 30 miles in a road test. Also it seems with every charge I am losing more. Sure like the looks of the truck though.

Please post some pictures so we can see your mods, thanks!

 

[ChasingCoral]

When charging to 90% before the lift I was getting about 264 miles of range. With no change in driving habits my range has dropped to about 208 miles. I viewed an almost identical conversion done by TC Custom on YouTube and they lost only about 30 miles in a road test. Also it seems with every charge I am losing more. Sure like the looks of the truck though.

Let’s try this again. How did you CALCULATE the change in range? is this change based on Trip efficiency, long distance drive, normal drive until empty, range estimate from the trip computer, or the Guess-O-Meter?

 

[SteelTerp87]

Let’s try this again. How did you CALCULATE the change in range? is this change based on Trip efficiency, long distance drive, normal drive until empty, range estimate from the trip computer, or the Guess-O-Meter?

Sounds like the Guess-O-Meter. Nobody seems to look at the kWh/mile

 

[2023 lighting]

There is a reason they talk about aerodynamics on EVs.

 

[sameye4m]

When charging to 90% before the lift I was getting about 264 miles of range. With no change in driving habits my range has dropped to about 208 miles. I viewed an almost identical conversion done by TC Custom on YouTube and they lost only about 30 miles in a road test. Also it seems with every charge I am losing more. Sure like the looks of the truck though.

You need to use your efficiency (mi/kWh) to calculate accurately the range hit. That’s the most accurate way to tell, otherwise you’re counting on whatever equation ford uses to calculate range. Which keeps changing and adjusting your estimated range based on a lot of unknown factors

 

[Richard's Lightning]

Thankyou sameye4m. ( I work with the numbers my truck gives me and have never heard of a Guess-O-Meter ). The math I was using is this :
Was averaging 2.3 miles/kWh on a daily route, no change in driving habits, and dropped to just 1.9 miles/kWh after the modification.
On a 90% overnight recharge I was consistently getting about 267 miles of range. We are now down to just 205.
Only change I have made is the level and rubber. The 295 60's are 1" taller then the 275 60's. That I have accounted for as well.
Will see if I can find a comparison on the rolling resistance of the two tire sizes I am working with.

 

[Voltz]

On a 90% overnight recharge I was consistently getting about 267 miles of range. We are now down to just 205.

Unless you are driving that far, I think that you're still too focused on the truck's range display. It will settle in somewhat. Work with numbers you know are accurate.

Also, I think you said that you are factoring in tire difference in tire size. Better is to GPS check your speedometer and odometer with the new tires and lift.

 

[Richard's Lightning]

Thanks Voltz. Have done that.
Speedometer at 60 mph will GPS at 61.9

 

[ChasingCoral]

Thanks Voltz. Have done that.
Speedometer at 60 mph will GPS at 61.9

Guess-O-Meter is that display on the left (usually) side of your instrument display that gives a range number. They are notoriously inaccurate for a variety of reasons. On Fords it is conservative.
Have you reset your speedometer? If not, did you adjust your new efficiency value to take the change in tire size into account?

 

[Richard's Lightning]

Thanks ChasingCoral. Yes, I adjusted by 3%.

 

[sameye4m]

Thankyou sameye4m. ( I work with the numbers my truck gives me and have never heard of a Guess-O-Meter ). The math I was using is this :
Was averaging 2.3 miles/kWh on a daily route, no change in driving habits, and dropped to just 1.9 miles/kWh after the modification.
On a 90% overnight recharge I was consistently getting about 267 miles of range. We are now down to just 205.
Only change I have made is the level and rubber. The 295 60's are 1" taller then the 275 60's. That I have accounted for as well.
Will see if I can find a comparison on the rolling resistance of the two tire sizes I am working with.

2.3-1.9 seems to be the average here, you’re not worse off than the average. 1.9mi/kW x 131kW = 249mi at 100%. Your 90% at 1.9mi/kW comes to 224mi range. Your displayed range is a little off, but in a good way hope that helps

 

[Richard's Lightning]

Will live with that. Thanks sameye4m.

 

[Leaf to Lightning : )]

on our Nissan Leafs, we've come to not refer to the sudden 'increase' in overnight MILES, such as 93, when we know that the vehicle's 'real world' miles, at most, is about 70, on a GOOD day. Sometimes the guessometer is somewhat correct, and sometimes it's just downright strange that it would give such a high number. As you drive more and more, you'll start to recognize the 'guessing' of the guessometer and know that those numbers are not really 'real'. You're driving habits and style will play into that, as well.
Just like with a gas truck, even when you know it's getting 'low' in the tank, and the guessometer is telling you that it's empty, or even PAST empty, you might have a feeling that you can still make it home - or, you may find that your 'feelings' are not correct, and the guessometer gauge was actually telling you something you should pay attention to! It's not an exact science, either.

 

[Richard's Lightning]

10-4 Leaf

 

[joelb1]

You also added more than 20+lbs per tire of unsprung weight.
The OEM tires are under 45lbs and the Wildpeaks are 65lbs!
That's alot of inertia to overcome....
I'll bet it looks cool tho!

 

[Richard's Lightning]

Absolutely joelb1. Tiresize.com told me 112 pounds total. Regenerative braking aside, if I want to coast and bump the truck into neutral, those heavy tires will free-wheel forever with the inertia.

 

[RickKeen]

Rolling resistance is highly sensitive to tire pressure. Did you inflate the new tires all the way to maximum pressure?

Its not just the rolling resistance of the tires that kills the efficiency. The air resistance is also a large factor.
You went from 356 square inches of frontal area per tire to 393.
Ignoring the tires being tucked into fenders, you added a square foot of front surface to push through the air. The truck is about 36 square feet to start with, so you added just under 3%.

Air resistance impacts the drag by a factor between the square and the cube of the speed. You can make up for a 3% loss in aerodynamics by driving 1% to 1.5% slower.