Fuel milage

[67ChevyRedneck]

You're not going to see much of a difference with a 700R. I "average" about 11-12mpg with my 700R "in town." I do get 15-16 highway, but like you, I don't drive highway often. For a 700R to work well in these trucks the cheapest rear gear option is the 3.73. The 3.08 is too high for a 700R in my opinion (and quite a few others). So you really wouldn't see any improvement at all during your typical drive. For what you drive, in my opinion, your current set up is about the best it can be.

Anyone getting 25-28mpg (in US measurement) with a TBI is completely full of crap. I don't know the converstion, but I know the Canadian gallon is bigger than the US gallon, even so, that seems high. 10-13mpg "city" is just about normal for ANY full size truck with a small block V-8 with just about any trans/rear end combo. The big difference is highway.

[dave69]

Originally Posted by 67ChevyRedneck

You're not going to see much of a difference with a 700R. I "average" about 11-12mpg with my 700R "in town." I do get 15-16 highway, but like you, I don't drive highway often. For a 700R to work well in these trucks the cheapest rear gear option is the 3.73. The 3.08 is too high for a 700R in my opinion (and quite a few others). So you really wouldn't see any improvement at all during your typical drive. For what you drive, in my opinion, your current set up is about the best it can be.

Anyone getting 25-28mpg (in US measurement) with a TBI is completely full of crap. I don't know the converstion, but I know the Canadian gallon is bigger than the US gallon, even so, that seems high. 10-13mpg "city" is just about normal for ANY full size truck with a small block V-8 with just about any trans/rear end combo. The big difference is highway.

No not that high with TBI guys were swapping over to Tune Port Injection. Getting better milage with that set up I just want to keep it old school hidden under the air filter Also we don't go by the canadain gallon anymore it's liters than convert to us.

[chevy_mike]

Originally Posted by 67ChevyRedneck

Anyone getting 25-28mpg (in US measurement) with a TBI is completely full of crap. I don't know the converstion, but I know the Canadian gallon is bigger than the US gallon, even so, that seems high. 10-13mpg "city" is just about normal for ANY full size truck with a small block V-8 with just about any trans/rear end combo. The big difference is highway.

Not true. My parents '91 Firebird, with a 305, auto and TBI routinely got 28mph highway and the best they did on a long trip was 32mpg. This was cruise control set at 65mph on a long, flat streach of freeway.

Biggest advantage of the Firebird is that is was very aerodynamic, unlike our bricks (or most any) of a truck.

I had a program at one time that would tell you how much power it took, at what speed based on how much frontal area there was. It was amazing how much more power something like a truck took to push thru the air then a streamline car did. It was even more surprising as you went up in speed. Something like twice the speed took four times the power.

[69GMCLonghorn]

Originally Posted by chevy_mike

Not true. My parents '91 Firebird, with a 305, auto and TBI routinely got 28mph highway and the best they did on a long trip was 32mpg. This was cruise control set at 65mph on a long, flat streach of freeway.

Biggest advantage of the Firebird is that is was very aerodynamic, unlike our bricks (or most any) of a truck.

I had a program at one time that would tell you how much power it took, at what speed based on how much frontal area there was. It was amazing how much more power something like a truck took to push thru the air then a streamline car did. It was even more surprising as you went up in speed. Something like twice the speed took four times the power.

Well, hell, if we're going off the truck subject, my in-laws' '86 Tore-ass would get us 34 MPG with 4 people and luggage on the highway!

[cparman]

My circle is very small, but on occasion I will drive to " TOWN" I would rather get 12 MPG, in my 69, than get 17 in a new Chevy Truck. Any of you guys get " the look " when you drive your 2006? Any of US get the look when we drive our 68-72 Damn right! I love my old truck!