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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old December 30th, 2017, 06:46   #1
cbman18j
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Default Fuel Economy Loss after Wheel and Tire Swap

So I have been using the Montereys with Continental True Contact for ~70,000 miles. My mileage has averaged 40-48 mpg roughly through 69,000 miles of highway driving depending if my indicated speed was 70 or higher. I switched to 17" Long Beachs with Continental Pure Contacts and it took me to 36-38 mpg on my normal trip. When I had the Arriettas installed with Extreme Contact DWS I average 39-42mpg on the same trip. Maybe it has something to do with possible winter diesel but I am not sure how far South winter diesel is this year do to the colder temperatures. I may swap back to the Arriettas eventually to see the larger than expected loss is do to the Long Beaches or something else.
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Old December 30th, 2017, 07:09   #2
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Are the tires outside diameters the same? What are the tire sizes?
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Old December 30th, 2017, 15:12   #3
cbman18j
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Quote:
Originally Posted by jayb79 View Post
Are the tires outside diameters the same? What are the tire sizes?
Both the Long Beach and the Arriettas are being run with 225/45/17s; the arriettas had extreme dws in that size
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Old December 30th, 2017, 18:40   #4
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The width of that tire is considerably larger(assuming you were running stock size b4???), more contact area is more rolling resistance. That would explain some of your loss.
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Old January 9th, 2018, 06:17   #5
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Tread depth also causes mileage change, new/deeper tread causes more resistance. Also larger overall diameter decreases the indicated miles, which doesn't change your "real life" mpg much, but does change the calculation results since it tallies up fewer miles on the odometer. Slight changes seem to multiply the results more than expected.
New tires have always returned less mpg than the worn out ones when I have replaced.
Heavier wheels are also supposedly a bit worse for mileage, especially for those doing more stop/go driving.
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Old January 10th, 2018, 05:03   #6
cbman18j
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Quote:
Originally Posted by jayb79 View Post
The width of that tire is considerably larger(assuming you were running stock size b4???), more contact area is more rolling resistance. That would explain some of your loss.
Yeah I was expecting some loss from switch from the Avus but compared to the artist has I was surprised by the loss
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Old January 10th, 2018, 05:07   #7
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Quote:
Originally Posted by jettawreck View Post
Tread depth also causes mileage change, new/deeper tread causes more resistance. Also larger overall diameter decreases the indicated miles, which doesn't change your "real life" mpg much, but does change the calculation results since it tallies up fewer miles on the odometer. Slight changes seem to multiply the results more than expected.
New tires have always returned less mpg than the worn out ones when I have replaced.
Heavier wheels are also supposedly a bit worse for mileage, especially for those doing more stop/go driving.
That makes sense because when I ran the arriettas the tires were not new, they were probably about 25-50% life left in them.
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Old Yesterday, 22:02   #8
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Quote:
Originally Posted by cbman18j View Post
Yeah I was expecting some loss from switch from the Avus but compared to the artist has I was surprised by the loss
It can be quite the drastic change...

You are going from a 35lb wheel and tire combination (Avus weighs 17lbs, 195/65-15 TrueContact tire weighs 18lbs)

And you are installing a 47lb wheel and tire combination (Arietta weighs 25lbs, and 225/45-17 PureContact weighs 22lbs).

Not to mention the additional drag of a 195mm wide tire compared to a 225mm wide tire.
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Old Today, 07:46   #9
2015vwgolfdiesel
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Quote:
Originally Posted by cbman18j View Post
So I have been using the Montereys with Continental True Contact for ~70,000 miles. My mileage has averaged 40-48 mpg roughly through 69,000 miles of highway driving depending if my indicated speed was 70 or higher. I switched to 17" Long Beachs with Continental Pure Contacts and it took me to 36-38 mpg on my normal trip. When I had the Arriettas installed with Extreme Contact DWS I average 39-42mpg on the same trip. Maybe it has something to do with possible winter diesel but I am not sure how far South winter diesel is this year do to the colder temperatures. I may swap back to the Arriettas eventually to see the larger than expected loss is do to the Long Beaches or something else.

....in general wheel tire swapping (IMO) is going to hurt your MPG.

... In general auto manufactures are pushed hard to get the best MPG results the day the car hits the rode.

... Respectfully your "style" changes are going to negatively affect MPG.
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