I am pretty sure they put "Real" tires on the spares, but I don't remember anything else.
Edit!
I didn't use the search box. I used google to search Ecomodder and just saw people talking about removing their spare.
However, when I used the search box I found:
Quote:
Originally Posted by MetroMPG
SPOILER ALERT:
Peakster'll probably be mad at me for posting the results here in the thread, but here's what he observed in an A-B-A test, with a pair of donuts (on the rear) for the B test:
A - 55.9 mpg (US) average (regular tires)
B - 60.9 mpg (US) average (donut tires)
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Video: Can Skinnier Tires Increase Fuel Economy?
Peakster wrote: "I purposefully put the smaller tires on the rear so that my speedometer and gearing would remain the same as with the larger tires."
Metro put 4 spares on his Forkenswift and they did significantly worse:
Quote:
Originally Posted by MetroMPG
To help visualize just HOW bad the donuts were compared to the RE92's (which henceforth shall be known as the Tires Of The Gods), a photo with the car at actual starting & stopping points:
I used a big parking lot that's empty on weekends. The starting "hill" isn't huge - maybe a couple of feet elevation change where the entrance/exit goes up to meet the road grade.
But it was enough of a slope that the car rolled...
- 216.9 feet on the RE92's @ 51 psi (average of 5 runs).
- 155 feet on the donuts @ 70 psi (average of 2 runs).
- just 138.8 feet (!!) on the donuts @ 51 psi (average of 3 runs).
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https://ecomodder.com/forum/showthre...tml#post265031
The last comment on Metro's thread was:
Quote:
Originally Posted by iveyjh
When I bought 5 doughnut spares from a Altima I tried them out on my Metro before I put the Continental eco tires on. Results similar to what you had, that's why I picked the RE92's.
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I also found
Quote:
Originally Posted by SuzukiSteve
I been running this set up for 6months/15,000 miles. Nissan Altima spare rims fit my suzuki siwft/geo metro lug pattern. They are DOT stamped and dont look like donut wheels. I have nice 155/80R15 BF Goodrich tires. rated to 55psi andlike 140mph. The rims are 4" wide so technicaly im one size (1cm) too wide, dont notice and dont care. They do rub the fender well a little in tight turns but its acceptable.
As far as mpg gains. My car is rated 32city 38highway. With good amounts of hypermiling i manage ~44mpg (mostly city) before correcting for tire size. Thats ~50mpg. Did not aba them, and my driving route changed at the same time as the tires so im not sure of the gains from them. but i suspect they get me ~5mpg. 
I love how they look too!  And I just covered the rims with $3 walmart pizza pans.
My boss Glenn did a write up of it over on GMF. Pictures Included!
15" Wheels and VW Tires |
https://ecomodder.com/forum/showthre...els-16886.html
That was the term. Someone put spacesavers on his car, which were lighter than Insight rims.
Unfortunately, the link is dead, and I cannot find it archived, although I believe that he referred to it elsewhere, so that may have some information.
Well, I need to drive to see 1-4 clients!
