Black dawg
Registered User
My friend has a 94 3/4 4x4 burb, that has always gotten 13-13.5. The thing runs great and sounds great never any smoke or stink. Is there something with the pump that could cause poor mpg?
94 6.5 poor mpg
- Thread starter Black dawg
- Start date
79jasper
Chickenhawk
I'm trying to remember what year the electric injection pump came out, because the optical sensors could get dirty or out of adjustment in those. Also is it turbo?
tanman_2006
Full Access Member
94 burbs only came in turbo models with electric DS4.
What are some if any mods or maintenance that have been done to the burb?
With the stock turbo and a burb that likely has 4.10 gears you are pretty much stuck below 15. Alot of mpg gains are made by driving style when we talk about a stock turbo.
What are some if any mods or maintenance that have been done to the burb?
With the stock turbo and a burb that likely has 4.10 gears you are pretty much stuck below 15. Alot of mpg gains are made by driving style when we talk about a stock turbo.
Black dawg
Registered User
Yes, pretty sure it is 4.11 geared. And it gets 13.5 pretty much regardless of anything. took a 1k mile trip one time at 60 mph, 13.5 mpg.
It is completely stock 220k.
just seems wrong, my 454 3.73 geared burb will do 10-12, towing or not, no overheating, and gas is much cheaper.
It is completely stock 220k.
just seems wrong, my 454 3.73 geared burb will do 10-12, towing or not, no overheating, and gas is much cheaper.
tanman_2006
Full Access Member
The factory exhaust on early 6.5's is choked down BAD in the down pipe and it might have a cat converter. While it isn't really guaranteed to increase mpg by opening up exhaust but it can't hurt.
The biggest gain is found when you get rid of the pos factory turbo.
Regular maintenance including ip timing, good lp and ops, changing injectors every 100k miles, and keeping the turbo system working right can go along ways
The biggest gain is found when you get rid of the pos factory turbo.
Regular maintenance including ip timing, good lp and ops, changing injectors every 100k miles, and keeping the turbo system working right can go along ways
tinker927
Registered User
I have a 1997 6.5 always got 15 to 17 mpg till I changed out my gear ratio. I had 4:10 ratio in it before changed to a 3:73 and my fuel mieage jumped into the high 20's average around 26mpg at 65
tanman_2006
Full Access Member
Can't say I believe 26 mpg in a 4x4 burb but there is merit to gaining mpg with a gear change. The problem is it takes alot of time to recoup your $ on a 4x4 gear change when you can get a better turbo for $700 iirc and tune for 300 and get performance with mpg increase it seems like money better spent.
tinker927
Registered User
it might be money better spent but my 4:10 pinion gear shaft was bad that is the intial reason I changed it but went to a more road gear. Picked up better mileage in 23 to 26 range depends if I can find fuel that doesn't have ethanol in it which is getting harder I use Lucas Fuel Additive and Marvel in my fuel tank. But have also found out that Vaccum pumps and fuel sensors can really screw with your fuel mileage too. I would love a new turbo but it will have to be on the next motor I build this one is strong at 324,000 miles still.
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