Just new to the site...thought I'd throw this bit of history up
I've actually owned 10 different 5.0ltr V8 Mustangs...but now that I'm here at GasSavers...I recall 2 cars specifically. Both '87s...both GT's.
BOTH cars had a fresh major tune up and were 130,000km or more...5spds...lowered 1.5-2"...stock replacement K&N air filters...no air silencer...10W30 Mobil1 synthetic engine oil... TPS sensor set as close to 1Volt as possible...timing was advanced...94octane Chevron fuel(in the early '90's)...no A/C...Weld Draglite rims(9 1/2lb fronts at 3 1/2" wide, 35psi...and 11lb rears at 10" wide and 32psi).....Hmmmm, I'm fairly sure that was all that was done to those cars. And the thing is...those mods were done in the name of increased performance.
For ****s&giggles...I do recall doing SINGLE run hwy mileage recordings with these 2 cars. I also recorded a few 'city' tanks...17mpg if driving 'normal/fun'...20 if driving full 'Grandma' mode....all this while having over 225hp and much more torque on tap in a 3200lb car.
Car1 got 32mpg on a summer hwy cruise...I don't recall specifics other than that...but it was nearly a full tank worth I'm sure.
Car2 hit 34mpg hwy...average temps...not steep, but a good mix of hilly/flat terrain, very light on the throttle and VERY conscious of throttle usage overall...keeping speed between 90 and 100km/hr over a 6hr trip.
Car1 had a 2:73 rear end ratio and car2 had 3:08's...
Looking back on these cars now...I wonder how much the occasional full throttle fun-fest impacted their overall FE when calculating an average?
Anyways...just thought I'd throw that out there
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