Decent Mileage on the 4.6L Aeros

[jeff urban]

ya i think somethings up with your car man. i deliver pizzas in my 96 mgm and get high 18 mpg and i have a bad o2 senser

[seneeb]

i was getting 16-18 in town hotrodding my chipped/geared 97. i still got 25-27 on freeway runs

[Ryan]

30mpg club here in my 95. My 04 PI gets 26ish if i keep my foot outta it.

[Grandmarchris]

I get about 19 mpg mixed highway/city driving. On the highway I get about 25

[Lincolnmania]

i rented a brand new grand marquis in 89 and i got 28 mpg
when the towny had a lopo and 3.27's i got 25 mpg on a trip to cape cod

[Mercury93]

I can get 15-16 in town out of my '93. I recently got 29 on the highway during a trip to NY.

[DriverSideImpact98]

Yeah I agree sounds like somethings up. Does your car run fine? No misses/hard start/rough idle?
When I had my '83 Caprice with a 305 and an un-tuned 4bbl carb i'd get 13mpg 95% city short-trips. My '98 Grand Marq. LS gets 17's beating on it a bit and low 19's normally around town. 21's on a 60/40% mix and around 24-26mpg on a 20/80% mix. But I have gotten as high as near 28mpg with like 95% Highway.
Change your fuel filter and air filter for starters.

[Grandmarchris]

19.8 is a little low for highway mileage what kind of fuel have you been running?

[DanHool]

i get 24 with 3.55 sucks still

[Spaz]

hey thanks for al the input i think its just driving in the vicinity of NYC. ive done some long highway drives last month and even with about 30 mins of bumper to bumper traffic got 23mpg. i guess where i live there are too many stop signs and traffic lights to get decent mileage

[theredlineboss]

Man, you guys suck; complaining about high teens/low 20's. I get about 20 MPG with mine. Highest EVER was 22 (95% highway), lowest was 12.5 (70% city, in winter).
With my current 20 mpg, my City/Highway ratio is 50/50.

-Rob

[86VickyLX]

Now your issue is probably simple like it was on my 94 that I had, collapsed vacuum line up by the intake, kills your mileage and definetly does not help performance at all, check all your vacuum lines and make sure they look good, I bet one is collapsed thats what I think it is and thats a major factor, also check your o2 sensors and cleaning your MAF will not hurt but don't expect a major gain out of it. Collapsed line and Im sticking to it, ive seen it on 3 aero body vics

Our Aero had a deteriorated vacuum line behind the intake, which would cause it to stall and run badly. I think our aero gets some nice mpgs, but wouldn't know for sure cause our odometer's busted