Quote:
Originally Posted by mystere485
this is true, it will be used for highway driving, 2000+ km trips at a time.
there are members getting 24-25 mpg with no mods in their crown vics. Ok, so we use that as a base. First mods:
LRR tires and light weight rims
Replace the engine fan and clutch with an electric assembly
underdrive pulley
build a front air dam and belly pan
block off the bumper intakes and replace the grille with 1992 style model
HAI
tune-up, oil and trans fluid change
get rid of the spare, jack, replace the front bench seats with newer buckets
Replace rear side and quarter glas with plexi
lower car 2 inches
If feasable, swap intake and exhaust manifolds and switch to PI heads.
should these mods not get me to 30 mpg?
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Aero:
- build a front air dam and belly pan
- block off the bumper intakes and replace the grille with 1992 style model
- lower car 2 inches
These will help, I'll be optimistic and say 10% gain here.
Weight loss:
- get rid of the spare, jack, replace the front bench seats with newer buckets
- Replace rear side and quarter glas with plexi
This will have minimal impact on highway mileage. Weight has more impact on city driving (start/stop) and lots of hills. I'd guess less than 1% gain.
Other:
- LRR tires and light weight rims - could be 2-3% if combined with higher tire pressures.
- Replace the engine fan and clutch with an electric assembly - no impact on hwy mileage over working mech. fan with clutch.
- underdrive pulley - small gain, less than 1%
- HAI - small gain, less than 1%
- tune-up, oil and trans fluid change - no gain, this will only make up for a loss of mileage you may have.
If feasable, swap intake and exhaust manifolds and switch to PI heads. - small gain, probably not worth the cost.
Optimistically, I'd put you in the high 20's with what you listed. 30mpg would be a stretch.
You say some are getting 25mpg with those... Have you put any miles on it yet? What do YOU get with it?
Higher tire pressure and driver education are the free mods you should start with. Get an Ultra-Gauge or Scan Gauge (I didn't catch the year, it's 96+ right?). Then start picking the low hanging fruit, lighter wheels, aero wheel covers, grill block, etc. Once that is done, see where you are at and go from there.