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Originally Posted by Matt Herring
Depends what type of tire you deleted and what type of tire you added. If you removed LRR tires and added a HRR tire you will lower mpg. If it's the same tire you will have a breaking in period for the new tires that will lower mpg.
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Old tires weren't fuel savers, while the new ones are.
Quote:
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Also, any added weight in the car will lower FE. Your seats could be an extra 50, 75, 100+ lbs. that you are dragging around in the car now.
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Is there any rough figure of how many less MPG for each lbs that are added on? I.e. 1% less MPG for 50 lbs added on?
Thanks!