newbie here with ? about gas mileage
 

hello everyone love this site still learning the ropes on here so
dont bash me
i will be getting my grandfathers 1973 gmc truck lwb I6 auto "not for sure which I6 it is" anywho i was wondering the avg gas mileage on this truck
it is in great running shape papa said so any help would be great thanks up front
:metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal:

Re: newbie here with ? about gas mileage
 

well i have an 1986 with a 350 and she get around 13. i beileve that about average for these trucks. Now if you had a 305 and 2 something rear end gear your mpg will go you your transmission mostlikly is a th350.

Re: newbie here with ? about gas mileage
 

Scooby Doo is probably pretty close -- i would not be surprised if it got as bad as 10, or as good as 13 or 14 and anything in between. The type of auto and the rearend gear ratio will affect this somewhat. A lot of times, the factory put steep rearends in the I6 trucks to boost the torque, but it would not make sense to put a heavy duty th400 back there, so it is prob a th350 (unless its a 'glide -- but i dont even know if those were available anymore in 73

Re: newbie here with ? about gas mileage
 

i dont think the glides were either and i know that finding a cast iron one is damn near impossible.

Re: newbie here with ? about gas mileage
 

Go into the gas station when you get it and fill the tank. Then, drive it till it's low again, and fill it completely back up. Divide how many miles you drove by how many gallons you had to put in the tank.

Re: newbie here with ? about gas mileage
 

yeah thanks guys i can't wait to get it and start fixing it up i will be getting a 72 nova with a I6 ans a powerglide later on as well it is a two door but brown on black a very basic car but runs great
and again i thank you guys for the help
:metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal:

Re: newbie here with ? about gas mileage
 

I going to say somewhere around 12 or 15 depending on wats all running good or not.

Re: newbie here with ? about gas mileage
 

if u do a crap load of performance stuff like me...you'll get 6-8 depending on wind and slope :D

Re: newbie here with ? about gas mileage
 

My guess would be a 292 strait 6, th350, something around a 3.42 gear. I would estimate mid teens for gas mileage.

Re: newbie here with ? about gas mileage
 

rock n roll guys thanks for all the help and input this site rocks
you guys are a great help
hope i can help you guys and others soon aswell
:metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: :metal: