JohnEod

I searched the forums for a while and didn’t turn up anything solid. My question, is there a formula for +hp = -mpg. Say I want to just do some basic mods maybe just a CIA and gears. How will the +30 or so HP affect the MPG on this my daily driver.

Thanks,
John

V8 Aggie

more HP= heavier foot= horrible MPG!

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2005 Mustang GT Mineral Grey
SCT tuned by Brenspeed, Saleen short shifter, Raptor shift light, Flowmaster axleback exhaust
BFG DR 275-40-17's on the way!
13.7@102 MPH- Texas Motorplex
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RetiredGeneral

nope... more hp doesn't always mean worse mpg...

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Rick

2005 Mustang GT, Manual Trans, White/Dark Charcoal
1998 Harley Softail Custom
1963 Lincoln Continental Convertible

Hufenstang

my mpg actually went up and im 324rwhp compared to the 260ish at stock.

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black 05 mustang gt... too much to list. Getting blown is fun~ try it.

one_focused_svt

more HP = less work for engine = better mileage IF drivin right........LOLOLOLOLOLOLOLOL STOMP IT [sm=gears.gif]

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Sleeper05

more hp when NA results from better efficiency turning the fuel into work. at partial throttle this means that the same amount of gas burns more completely, but at full throttle, the more complete burn allows more gas than before to be burned (and more air to be sucked in), which would result in lower mileage but increased fun

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05 gt:
345/335 --> 427/471 with the flick of a switch

PR Manager for Automotive Dezignz
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JohnEod

That's good news then. More HP means better MPG for a daily commute and more ass-kickin power when I want it [sm=devilgrin.gif]. Win - Win for me. My next question would be at what point does the increase in HP level off with gained MPG at partial throttle?

John

Shard Phoenix

Their isnt going to be a really concrete answer to what your asking. But all in all, most bolt-ons will give you MPG. As far as your MPG VS throttle question, the slower you accelerate the bettter MPG you will get. my car (Manual GT) seem to run most efficiently at 75MPH(26.0 mpg at an average of 76MPH for 320 miles), so if you want max MPG just stay their :P. When your in the city just keep the revs down and dont get on it, thats the only way you will get MPG.

johnnyv8

get a civc,lol...jk, try to keep it in you od or 5th gear as much as possible...lower the rpm, less the engine working, hence better mpg.

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2006 5-spd Mustang GT- Black with red int upgrade; skipper500.
Pypes Mid System Cat Back/ FRPP X-Pipe/(3.90 Gears in process)
Best 1/4 Mile-13.32@104.5mph 60ft-1.997(BONE STOCK)
Ron*Paul 2008