The thing your V8 is pushing might be less cinder block- like in aerodynamic terms, or not weigh 5,000 lb.
Losing 1.5 mpg from the V8 might not be too bad....and 18-19 mpg overall at 80 mph isn't bad either.
I get more like 20-22 mpg on the highway...but I'm running 33x12.5's, so its like I'm in super overdrive.

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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif