[mwebb]

you have learned by painful experience that the skinny wheel tire combination does not yield good fuel economy
why not switch to
14" teardrop wheels originally used with mk 2 gti and gli and 185 60 14 or 195 60 14 michellin harmony tires , it is easy enough to fill in or tape over the tear drop to give a very flat pizza pan type surface and that combination will improve FE over what you are using now
or
early acura integra 14" aluminum wheels bored to accommodate vw hubs
i have used both
in the past with great success

Originally Posted by diesel_john

Since this thread started 3 yrs ago i have bored out two Ford space savers to VW center I.D. and measured no mileage improvement. They were T115/70D14's which may have a higher rolling resistance. Now switching back to 155r13's.