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Old 06-23-2009, 04:46 PM   #6 (permalink)
Vwbeamer
EcoModding Apprentice
 
Join Date: Jan 2009
Location: Macon,GA
Posts: 176

Ruint Taco - '19 Toyota Tacoma SR Double Cab
90 day: 23.76 mpg (US)
Thanks: 124
Thanked 43 Times in 34 Posts
I was thinking of putting a set of the old VW's beetles 165 r 15 tires on a stock set of Jetta steel rims.

They are the same height as the TDi stock 195/65/15 tires, but 30mm narrower.

Based on my calculations, this would be worth about 2-4 mpg. based on the 2 mpg I lost going from the stock 195 tire to a 225/45/17 tires and rim on my Jetta Tdi.

The 165's would have less areo drag, less rolling Resistance and be about 3-4 pounds lighter over the stock 195 sized tire.

AS for safety, the old VW buses weighed about as much as the jetta and used similar sized tires. Admittedly, they were much slower.

Also, I have 100% grill block on the upper grill, with no engine over heating, even with recent 100 degree heat we have been having in Georgia.

I feel there is a greater areo advantage to blocking the upper grill, as it smoothes the air going over the hood.

Obviously, you can't block both.

Good luck.

Last edited by Vwbeamer; 06-23-2009 at 04:51 PM.. Reason: corrected tire sizes
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