Gas mileage on my 66 1500
 

Well, I had to know and wish I didnt...checked the mileage on the 66 couple days ago and granted, she needs a tune up, I wasn't expecting what I got, nor was I expecting 15-20 mi/gal either. However, I checked it after running g around town a few days and 6.35/gal is all I'm getting. Yes I did the math 3 times and cane out the same every time. So how about anyone else, how good/bad is your mileage. I'm running a 350 with sm420 behind it...tell me it's gonna a get better after a good tune up lol. My financial advisor (wife) "advised" me to get better mileage or we both are headed for scrap yard.....

Re: Gas mileage on my 66 1500
 

Are you running a 350 engine like you stated? Guess that's what we need to know first - is it a GMC V6 305 or a GM 350 V8 as you stated? Anyway - the mileage you are getting now is proof that there's a major tune-up needed - in either engine. :unsureGMC:

Re: Gas mileage on my 66 1500
 

350 v8 and yes indeed seriously in need, happening as we speak. This thing sat for over 2 years without being driven just the rarely started up to run a few minutes...she's getting the tlc needed...