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My 84 300D with untouched ALDA (boost management) and deleted EGR has never had over 29.6mpg. I average around 26mpg with a fair amount of parking lot highway traffic.
I think the most I ever got out of a tank was about 475 miles and that was when I was wide-eyed and worried that I wouldn't find a gas station in while driving in the middle of nowhere. I usually fill up around 425 miles.
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