I searched for a while didnt find the answers though.. Until I fix my fuel gauge...

In gallons, how big is our thirdgen fuel tanks?

...and

Im running an 86 stock 4BBL...

How many miles per gallon city/hiwy do they get?

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I have a 1991 Trans Am and my tank is 15.5 gallons. Generally in the city i get about 14.5 mpg. I have a tpi though so i dont know what yours will get.

 

I have an 86 IROC with the LG4 305 4BBL. On the highway I get right around 21 mpg (last I checked) and about 17 city. I believe the tank is 13 gallons.

Mark

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1986 IROC LG4 "Bone Stock" (for now)

 

Search the archives, I asked this same question. I believe they are 15.5 gallons if I remember correctly.

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"Putting any amount of money into a RICE BURNER is like wiping your a$$ with a turd. "
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

Yes I believe the factory does say 15.5 gallons; but how much difference there is from fill-up to run-out-of-gas seems to vary somewhat from one car to another. No doubt this is due to indvidual variation like the rake angle of the car and how low your pickup extends into the tank (i.e. how much gas is left that you can't use); I don't recall ever getting over 15 gallons into my car, about 14.7 or so is it.

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