bad mpg
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New User
Joined: Apr 2003
Posts: 24
Likes: 0
From: at the beach
bad mpg
i have an 88EB and i get 8.5 mpg. it has efi and a k&N and 3 inch exhause with no muffler and i still get really bad mileage. i was thinking it was injectors. i really don't know what it is i have tried just about everything. could my cats be plugged up? i only have 33s on it and 3.08 gears. any help would be great thanks
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Tuned
Joined: Mar 2002
Posts: 250
Likes: 0
From: Grants Pass, OR
bad mpg
Yeah, it's probably a good idea to give it a good tune-up and do some of the suggestions there in the link that Steve left you for project mpg.
I think the bigger problem could be the 33's w/ 3.08 gearing. Your motor is probably working too hard while trying to get those tires to turn.
I think the bigger problem could be the 33's w/ 3.08 gearing. Your motor is probably working too hard while trying to get those tires to turn.
Posting Guru
Joined: Jul 2001
Posts: 1,914
Likes: 1
bad mpg
With 3.08 gears and 33" tires, I'm surprized it will move without holding it on the floor. You need gears-BAD. My Bronco has 3.55 gears and 31" tires and it's sluggish. If you want to run the bigger tires, I would suggest something along the 3.73 gearsset. It will let the motor run at a higher RPM with out having to struggle to pull the truck.
Steve,
Nice links, thanks!
Steve,
Nice links, thanks!
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
bad mpg
WOW, and I though 33's and 3.55's sucked. So, you must turn about 1100 rpm in overdrive at 70 mph... (if you have the overdrive). I only turn about 1800-1900 at 65-70....and that sucks! No "giddyup" to pass and a LOT of downshifting to keep up to speed on the hills. Definately, get 4.10's or 4.11's in it...you will see a major improvement. The problem is the engine being so far out of its power band which for most small block V8's is closer to 2500-2800 rpm.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
bad mpg
I'm running 32s and I can't WAIT to get back onto 3.08s! I got a LLT brake cable yesterday for my replacement axle, so all I need now is time to swap out the 3.55 axle. 
If I had OD, I'd probably stick with the 3.55s, though.
If I had OD, I'd probably stick with the 3.55s, though.
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New User
Joined: Apr 2003
Posts: 24
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From: at the beach
bad mpg
I have a 351 and a c6 with a tight torque converter and a shift kit and don't have any problem turning the tires, I will get new gears though because i can peg it in second and I want lower gears to get more power.
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