Bombing vs. mileage

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I had the pump turned up on my 95 truck. Went from 175hp to about 250hp. The fuel mileage went way up, both empty and towing. I know that mileage/bombing is a bell curve, so my question is this: At what horsepower rating will your mileage begin to decrease? This is based on volumetric efficiencies, I know... but is 300hp too much, 400? 275? All you hot-rodders and vendors too, lend me your experiences!

 

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Hey BCFAST---mine's at an est. 300-310HP and just other day recorded a "personal best" hwy mpg of 21-ish, (had never done better than 19-20 pre-BOMB)---overall mpg in urban mix driving has stayed right around 15-17 (I think some of this is due to an increase in TC slippage in lower gears)--lockup fuel efficiency has greatly improved, though---if you spend lots of time on the hwy @ cruising speed, 300HP is still good----now for an answer from any 400+ in the audience????

 

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445hp still average 18mpg, got 20 the other day when I checked it for 300 miles of 70mph plus and a sled pull.
Adam

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96 4x4, 3. 54 posi, 3" lift, 35" bfg m/t's,dual stabalizers, aluminium wheels, sport headlights,billet grill, tenzo blue foglights, K/N, NOS, Bullydog LPG, Tweaked Pump, Hx40 w/ 18. 5cm2, 4" exhaust w/ 2 chamber Flomaster, Jim Leonard street dual disc, Kenwood sterio System, Westach 60lb boost/ egt guage,aluminium bed rail covers, clear tail lenses w/ red bulbs,chrome diff covers, #10 tst and 370hp marine injectors, best performance to date= 445hp @ 2600 and 850lb of torque, and 14. 35 @ 98mph,
Adam

 

[Archive]

I was wondering that myself and my trip to Ted J's BBQ was a great test. . Cruising on mostly highways at 70 on the way up and anywhere from 70-75-80 on the way back. thank god for the Valentine1. . at half a tank of fuel i was at 350 miles on the trip meter... thats about 19-20 mpg... JB

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99 Black/Agate, Quad,Long bed,4x4, SLT,Auto,HX-40 16cm2 & ATS Exhaust manifold treated to Jet-Hot 2000(Gray),DD stage 3 injectors,4 wire Blue Box,"True" 5 inch Jet-Hot Coated exhaust from turbo to Tailpipe(Over the Axle),Borla Shoot-out Muffler,Suncoast converter, BD valve body and pressure-loc,Mag-Hytec trans pan,Amsoil ATF-4,Mobil Super Delvac 1300,fuel line up-grade from lift pump to filter and from filter to injection pump,Auto meter Ultra lite gauges:Boost,EGT,Fuel Pressure,Trans Temp, Valentine 1, EZ-pass