## Review Questions - Click On The Picture To Begin...

What is the best way to determine what percentage of the weight of fuel will go to each set of axles?

- The percentage is standardized amongst manufacturers and is the same for every truck
- Simply go by the number of gallons of fuel each tank holds
- Ask another driver what their numbers are
- Weigh the truck immediately before and after fueling, and do a simple calculation

#### Quote From The CDL Manual:

The best way to determine what percentage of your fuel will go to each set of axles is to weigh the truck immediately before and after fueling, and do a simple calculation

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You weigh the truck immediately before and after fueling. Based on the following, determine what percentage of the weight goes to each set of axles:

Before fueling:

steer: 10,200, drives: 31,300, gross: 71,700

After fueling:

steer:11,000, drives: 31,500, gross: 72,700

steer: 10,200, drives: 31,300, gross: 71,700

After fueling:

steer:11,000, drives: 31,500, gross: 72,700

- 80% went on the steer axle

20% went on the drive axles - 67% went on the steer axle

33% went on the drive axles - 75% went on the steer axle

25% went on the drive axles - 70% went on the steer axle

30% went on the drive axles

#### Quote From The CDL Manual:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle, divide it by the total fuel weight added (determined by the change in the gross weight), and then multiply that times 100

#### TruckingTruth's Advice:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle (800 pounds), divide it by the total fuel weight added (1000 pounds), and then multiply that times 100

800/1000 = .8

.8 * 100 = 80% fuel weight to the steer tires

100% - 80% = 20% went on the drive axles.

800/1000 = .8

.8 * 100 = 80% fuel weight to the steer tires

100% - 80% = 20% went on the drive axles.

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What is the safe number to use in calculations for the weight of fuel?

- 8 pounds per gallon
- 10 pounds per gallon
- 6 pounds per gallon
- 7.25 pounds per gallon

#### Quote From The CDL Manual:

The precise weight of diesel fuel will vary based on temperature and humidity, but is generally around 7.25-7.5 pounds per gallon. So the safest bet is to use 8 pounds per gallon as the number you'll plug into your calculations, and that's what we're going to use here.

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Where will the weight of fuel be distributed?

- Entirely on your drive axles
- Mostly to your steer axle, with some going onto the drive axles.
- Mostly to your drive axles, with some going onto the steer axle.
- Entirely on your steer axle

#### Quote From The CDL Manual:

The weight of the fuel in your tanks will be distributed mostly to your steer axle, with some going onto the drive axles.

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You weigh the truck immediately before and after fueling. Based on the following, determine what percentage of the weight goes to each set of axles:

Before fueling:

steer: 11,450, drives: 33,100, gross: 76,700

After fueling:

steer:11,850, drives: 33,300, gross: 77,300

steer: 11,450, drives: 33,100, gross: 76,700

After fueling:

steer:11,850, drives: 33,300, gross: 77,300

- 67% went on the steer axle

33% went on the drive axles - 88% went on the steer axle

12% went on the drive axles - 75% went on the steer axle

25% went on the drive axles - 73% went on the steer axle

27% went on the drive axles

#### Quote From The CDL Manual:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle, divide it by the total fuel weight added (determined by the change in the gross weight), and then multiply that times 100

#### TruckingTruth's Advice:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle (400 pounds), divide it by the total fuel weight added (600 pounds), and then multiply that times 100

400/600 = .67

.67 * 100 = 67% fuel weight to the steer tires

100% - 67% = 33% went on the drive axles.

400/600 = .67

.67 * 100 = 67% fuel weight to the steer tires

100% - 67% = 33% went on the drive axles.

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You weigh the truck immediately before and after fueling. Based on the following, determine what percentage of the weight goes to each set of axles:

Before fueling:

steer: 11,100, drives: 32,600, gross: 71,400

After fueling:

steer:11,850, drives: 32,850, gross: 72,400

steer: 11,100, drives: 32,600, gross: 71,400

After fueling:

steer:11,850, drives: 32,850, gross: 72,400

- 80% went on the steer axle

20% went on the drive axle - 65% went on the steer axle

35% went on the drive axles - 75% went on the steer axle

25% went on the drive axles - 67% went on the steer axle

33% went on the drive axles

#### Quote From The CDL Manual:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle, divide it by the total fuel weight added (determined by the change in the gross weight), and then multiply that times 100

#### TruckingTruth's Advice:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle (750 pounds), divide it by the total fuel weight added (1000 pounds), and then multiply that times 100

750/1000 = .75

.75 * 100 = 75% fuel weight to the steer tires

100% - 75% = 25% went on the drive axles.

750/1000 = .75

.75 * 100 = 75% fuel weight to the steer tires

100% - 75% = 25% went on the drive axles.

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What is the correct method of determining what percentage of fuel is distributed between the steer axle and the drive axles?

- Weigh the truck after running 100 miles, then immediately fuel up, and then re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.
- Weigh the truck immediately after fueling, then run exactly 100 miles, and then re-weigh the truck to see what percentage of the added weight came off the steer axles.
- Weigh the truck, then drive exactly 100 miles, and then re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.
- Weigh the truck, then immediately fuel up, and then immediately re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.

#### Quote From The CDL Manual:

In order to accurately determine what percentage of fuel weight goes to your steer axle versus your drive axles you can simply weight the truck, then immediately fuel up, and then immediately re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.

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