I have a '95 with the 3.0 3VZE V6. You think 67 to a quarter tank is bad? Thats 268 to a tank, that is 16.75 MPG. (Taking into account that you use 16 gallons of gas, and that 268 is your range)
More info on your truck is necessary. Have you done any work on it? We need ACTUAL fuel mileage info, like range and MPG. (calculated by taking gallons filled divided by mileage completed on that tank.)
I could say I get 10 MPG with mine (I do), get used to it, it is an SUV, but instead I'll give you advice.
Please note that this DOES cost money, so if you don't have any, I recommend you start saving now.
-Change your oil & filter to Mobil 1 10W-30 High Mileage formula (Helps swell the rings so that you can reduce oil burn, [If any]. (~$60) {1 MPG}
-Locking hubs (Asin). (Check eBay, ~$50) {2 MPG}
-Fuel filter. (~$10) {.5 - 1 MPG}
-Run a can or three of Seafoam through your tank. (~$7/Can) {0 - 1 MPG}
-Change sparkplugs to NGK IX - BKRSEIX. (~$44) {0 - 3 MPG + improved throttle response}
-Change sparkplug wires to NGK TX50 (~$40) {0 - 1 MPG}
-Change air filter to Genuine Toyota via Partznet (the ad at the top) ($15) {0 - .5 MPG}
-Change Transfer case, 75W-90, 1 quart
Front diff, 75W-90, 2 quarts
Rear diff, 75W-90, 2.5 quarts
To Mobil 1 Gear oil
(~$71.94) {0 - 1 MPG}
-Change your O2 sensor to Denso (~$90) {0 - .5 MPG}
-New headers from Downey (~$300) {More for power, lol}
-New exhaust from either flowmaster or a custom shop (~$?>200) {Again more for power}
-Tire pressure. Depending on your tire, it should be at ~35- 38 PSI. ($.25 if you have to go to a gas station) {0 - 2 MPG}
-Remove roof rack support beams and cross bars. (~$0) {.5 - 1 MPG, mainly for high speed driving.}
-Lighten the load, lose some weight. Either you, or what's in the car. ($fat) {0 - 5 MPG}
-Your driving habits. Try to not go past 2.75k RPM while accelerating. Pretend there is an egg under the gas pedal, if you break it. YOU LOSE!!! (~$2) {0 - 5 MPG}
Thats all the advice I have right now, I've been thinking very hard about getting better MPG with the 3.0, that is my advice.
Now if you'll excuse me I have a 5 page paper to write about change. lol.
Peace homes.
Phil