Here's my other car. The front wheels weigh less than 5 lbs each and mount 145 tires.
I picked up about 2 tenths by switching from a heavier cast aluminium wheel as seen here-
.
On my 2001 Jetta, I switch from the stock 195/65/15 to a 225/45/17 and
LOST
two MPG.
What would happen if I mounted a 165R15 on the Jetta, think I could pick up 2 MPG?
That would be great.