At those speeds engine off coasting is your best tool for significant improvement. Bottom line, when utilized properly, it should make a significant difference. I run 50 psi in my tires which makes a small difference over 44 psi. I share your situation, I have a limited monthly income, but significant assets. No loan payments, house paid for 20 years ago. A little money goes a long way when you aren't paying for your house and car.
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