03-01-2009, 08:25 AM
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Administrator
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Join Date: Jul 2004
Location: Wilton, CA.
Posts: 13,464
Thanks: 7,680
Thanked 2,335 Times in 1,096 Posts
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It is possible to get 15-18 mpg on the freeway with a 535 and efi, when tuned well. My Procharged 540 made over 800 rwhp and got 19 mpg on steady state freeway driving (70-75 mph) on a couple of 100-200 mile trips. But it didn't do so well in town, so it'd be tough to average 15-18, but doable for freeway driving in my opinion.
Jody
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