1966 GMC 305 V6 Service

[Rufton]

Strange road trip 305E V6 HWY milage.

1. 9.3 mpg (about 60 mph I-75)
2. 17.1 mpg (about 70 mph I-75)
3. 16.7 mpg (about 70 mph I-75 return trip)
4. 9.5 mpg (about 60 mph I-75 return trip)

Mileage calibrated against map quest.
Triple checked full tank when I got the 17.1 mpg; even saw gas in tank through filler neck.
Thought I was home free until the last 9.5 mpg reading.
I suspect the carb or distributor is misbehaving under 70 mph.
Maybe I'll advance timing a bit more than stock and verify timing advance is functioning. I'm a little suspicious of carb power valve function.

[Andice]

Rufton: Thanks for the detailed images of the oil filler cap. The cap in my 305E has two thinner mounting tabs on the underside. It kind if resembles the tabs on a breather/oil filler cap. I will consider trying a cap like yours. Can't explain your spotty fuel consumption, but mine is in the shop right now getting a proper tune since it has been backfiring a little. I may have damaged the power valve in my Holley carb

[TommyDuncan]

Originally Posted by Andice

Rufton: Thanks for the detailed images of the oil filler cap. The cap in my 305E has two thinner mounting tabs on the underside. It kind if resembles the tabs on a breather/oil filler cap. I will consider trying a cap like yours. Can't explain your spotty fuel consumption, but mine is in the shop right now getting a proper tune since it has been backfiring a little. I may have damaged the power valve in my Holley carb

I have a couple spare caps. I never compared them but they appear the same. When I get home I will compare them. PM me your address and I'll send you one.
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[duallyjams]

Originally Posted by Rufton

Strange road trip 305E V6 HWY milage.

1. 9.3 mpg (about 60 mph I-75)
2. 17.1 mpg (about 70 mph I-75)
3. 16.7 mpg (about 70 mph I-75 return trip)
4. 9.5 mpg (about 60 mph I-75 return trip)

Mileage calibrated against map quest.
Triple checked full tank when I got the 17.1 mpg; even saw gas in tank through filler neck.
Thought I was home free until the last 9.5 mpg reading.
I suspect the carb or distributor is misbehaving under 70 mph.
Maybe I'll advance timing a bit more than stock and verify timing advance is functioning. I'm a little suspicious of carb power valve function.

what's the rpm on the engine when your running 60-70 mph

[TommyDuncan]

Originally Posted by duallyjams

what's the rpm on the engine when your running 60-70 mph

I did the math and 60mph should be about 2150rpm. 70 should be pushing 2500rpm.
Posted via Mobile Device

[Andice]

I must have been smoking crack because my oil filler cap is just like Rufton's and likely the same as all other oil filler caps for this era GM vehicle. Sorry for the stupid posts and thanks for the offer T Duncan.