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Does driving on a spare tire make your mpg go down ?

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  • Does driving on a spare tire make your mpg go down ?


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Answer #1 | 22/12 2013 23:07
The spare tire is smaller diameter, so your engine is at slightly higher RPM (if its on the front) to get you to speed. Also, the temp tire is made of a very soft and cheap rubber, so there is high rolling resistance.
Answer #2 | 23/12 2013 00:22
yes it will affect your gas mileage, greatly so, that is why they are only suppose to be driven on a max of 50 miles. Just enough to get you to the tire shop to get it replaced!
Answer #3 | 23/12 2013 01:25
Yes your car was tested with the stock parts a spread is a different sizes and will affect MPG just as carrying a heavy load will or upsizing the rims
Answer #4 | 23/12 2013 05:19
That much lessening in MPG seems quite excessive. Remount your running wheel and tire and recheck. It seems possible another fault causing that fuel mileage drop, but you should clear the faulty (spare tire on) condition to find out for sure.
Answer #5 | 23/12 2013 10:27
Yes, you can certainly expect a drop in fuel efficiency. More importantly, if you are using a compact spare it is only meant to be used very temporarily. 50 miles or so, max, and at a top speed of 50 mph. Compact spares are simply not designed to be pushed beyond these limits. Replace it asap.

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