without knowing how much the lower rolling resistance tires actually save, the most economical tire is about as clear as mud, especially when tring to balance with performance.
Of my top 3, General altimax rt43 has the best ratings on tirerack, and are the least expensive, but are not lrr tires. Michelin defenders have near the ratings of the generals, are lrr, but cost considerably more, Goodyear fuelmax (185/65-14) cost about as much as the michelins, have lower rolling resistance, but performance isn't rated as highly.
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