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Don't believe me, like I said it's pretty well documented for RVs and towing trucks. While the improvement isn't staggering, you're still talking about over a 10% increase in fuel efficiency. You loose some at none moving idle, but under motion you instantly pick up over 20% energy efficiency (or better) and then start thinning out your gains at the high end as fuel demands increase.
I think all of this is moot however as he hasn't been back on in a month.
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