firefighterjed
SILVER Star
I Used a GPS To compare my speedo to actual speed and calculate my % off that. My 32” tires make my speedo exactly 10% slow. When I figure my miles I add 10% to the odometer.
FJ40 Gas Mileage.... (1 Viewer)
- Thread starter ArkyFJ40
- Start date
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JohnnyC
Long ago TLCA# 2231
Mine is off by a tad more than 10% (33” tires) ... but... I do 10% because my brain can't rap my head around that 1% more doing the math on the fly 
Too much information already in there clogging the inner workings of anything else ... it’s what happens when you get older... you just don’t give a crap about piddly shet anymore
Too much information already in there clogging the inner workings of anything else ... it’s what happens when you get older... you just don’t give a crap about piddly shet anymore
A 2F drinking 2X fuel per mile needs tuning, or it is going to wear out quicker. Now, 8mpg might be low, and a slightly tricked out 15mpg might be high (but he is hauling a hard top, doors, and brushguard). But, carbon build-up can cause pre-ignition when it is glowing, a vacuum leak can toast a valve.
I'd start with a plug reading (take each one out and photograph it for lean, rich, or oil fouled conditions). I'd check the their gap, clean them, apply anti-seize, and reinstall. I'd also check resistance over the plug cables with a multi-meter. Do you have header? What brand? Is your intake manifold cracked over the heat riser (check from under the truck, with a mirror, or, if the carb is off without a stock exhaust manifold)?
I'd start with a plug reading (take each one out and photograph it for lean, rich, or oil fouled conditions). I'd check the their gap, clean them, apply anti-seize, and reinstall. I'd also check resistance over the plug cables with a multi-meter. Do you have header? What brand? Is your intake manifold cracked over the heat riser (check from under the truck, with a mirror, or, if the carb is off without a stock exhaust manifold)?
77mustard40
SILVER Star
I run my mighty 2F with an FJ60 big cap dizzy re-curved by Jim C, original 4.11 gearing with 33 inch tires (rubber overdrive) and she typically gets 12-14 (odometer not GPS).
I used to tell folks that asked about my MPG that she got 13... uphill, downhill, headwind, tailwind, 2wd, 4wd ... agree with Claudia, smile per mile.
I used to tell folks that asked about my MPG that she got 13... uphill, downhill, headwind, tailwind, 2wd, 4wd ... agree with Claudia, smile per mile.
350 V8 with 33’s and about 15MPG with goobs of power, but I know all the stockers will scream lol. Sorry had to thro it out there.
Typically do 12-14(best) on highway. Carb rebuilt by Jim C. Very stock.
