MPG and fuel tank capacity for my T/A

[gm94]

Hi all, I'm trying to compare the fuel economy of my T/A vs my 94 Grand Marquis. This is the info that I have found in different websites:
1998 T/A formula 5.7L v8 Fuel tank capacity= 15.5 gallons or 11 gallons? Some websites listed different, I think is 15.5.

MPG using regular fuel
city=17
highway=26


It says that my GM 1994 has:
fuel tank capacity= 20 gallons
MPG using regular fuel
city=16
highway=23

It seems that the T/A does better gas mileage but has a smaller fuel tank.
I'm just trying to see if is the same or better with my T/A since I just took a round trip from Orlando, Fl to St. Augustine, Fl and it used 5/8 of my fuel tank. I haven't tried the GM 94 yet for the same trip. Thanks in advance.

[Genopsyde]

15.5 sounds right to me.

[gm94]

Thanks Geno.

[philly rs]

hell i have a moded 5.7Lt1 and going 80+ i make it from tampa to ft lauderdale/miami on 1 tank...and also from tampa to ga...right over the boarder from fl on a single tank as well. hell i think thats pretty good.

[cuda_dude]

I got 30mpg with my Camaro before I put a cam in it. The tanks are 15.5 mpg if i remember right... the best way to increase gas mileage is to let it breath better... intake and exhaust...

[Blackcrow64]

Geez, this makes my v6 sound pathetic cause I'm only getting about 15.8 mpg out of it...

[cuda_dude]

wow... i get better out of the 350 vortech in my Sierra.. I got 17mpg on the last tank...