gas mileage with 33s

[jd70ssclone]

i have a 86 k5 with a carbuerated 305 with the th700r4 overdrive automatic and i have a set of 33s i was lookin to throw under neath of it i havent driven the truck yet so i dont know what the gas mileagebasline with stock tires already is so i was wondering if anyone has a similar combination that could tell be what they get as far as gas milage goes thanks
josh

 

[dyeager535]

Not going to be very happy with that IMO. 305, 700R4, plus whatever gears are in it (probably 3.08's) means a hard life for that 700, and you'd likely never want it out of 3rd gear.

 

[habitatxskate]

i got a 350 700r4 3.42 i think, not sure...

it isn't that bad, and for gas mileage do the math i mean its pretty simple...

the milegage you go divde that by the gallons you put in

 

[jd70ssclone]

it has 3.73 gears. and i know how to figure out miles per gallon i was just wondering what i may get around cuz right now with the price of gas im lookin at buying a volkswagen

 

[loafer]

i got a 350 700r4 3.42 i think, not sure...

it isn't that bad, and for gas mileage do the math i mean its pretty simple...

the milegage you go divde that by the gallons you put in

You also need to correct for odometer discrepancy; If your stock tires were 31s and your new tires are 33' multiply your calculated mileage by 33/31. In this case your actual mileage will be about 6.5% higher than your measured.



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[dyeager535]

I doubt it will increase, if that's where you were going with this. Typically the higher up you go, the worse mileage you get. Again, talking 1-2MPG max, but that's 5-10% difference for a lot of these trucks.

 

[loafer]

I doubt it will increase, if that's where you were going with this. Typically the higher up you go, the worse mileage you get. Again, talking 1-2MPG max, but that's 5-10% difference for a lot of these trucks.

I realize that in this case it is a small error. But I see some pretty high mileage claims and I sometimes wonder if people are not compensating for the speedo error.

In my case it works out to 10%, but the other way due to the addition of 4.10 gears. So when I calculate my mileage and get 15mpg my actual mileage is 13.5mpg. To me, 1.5mpg is significant error, when trying to determine how varios changes to a truck will affect mileage.


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[sandawgk5]

with a 350, 700r4, 4.10s and 37s I get 10 around town and 13 on the highway. The worst I got was 6 and that was switchbacks in the mountains on my out to TDS and I had a hub locked with a welded front .

Needless to say old school fullsize rigs do not get great mileage unless they are running a 6.2.

Dick

 

[Indyblazer]

Excellent Gas Mileage on 33's

I have an 84 K5 with a 305/700R4 33x12.50's.

I found the ONLY way to get good gas mileage with this combination is LIE about it !! I ALWAYS tell anybody that asks about MPG that I get 26 City/38 Highway. It is a K5. I drive because I love it... not for the MPG.