Heres some info for you. Bought a 2006 King Ranch crew cab long box 6 liter with 88000 kms on it out of the USA. It was completly stock with not even any mud flaps. Mint shape. Picked it up and drove 1180 kms on 128 L of fuel. Drove some city and 90%freeway at 120 kms.
Brought it home and put in shop and installed 7 inch lift,35inch toyo's ,box liner,sled deck,Banks big hoss kit with speeded brake and some mud flaps. Guess what??
700 to 750kms to 130L of fuel and all that changed was the crap i installed.
You want fuel mileage you run smooth tires no lifts or anything bolted to the truck and keep as light as possible.
Heres some info for you. Bought a 2006 King Ranch crew cab long box 6 liter with 88000 kms on it out of the USA. It was completly stock with not even any mud flaps. Mint shape. Picked it up and drove 1180 kms on 128 L of fuel. Drove some city and 90%freeway at 120 kms.
Brought it home and put in shop and installed 7 inch lift,35inch toyo's ,box liner,sled deck,Banks big hoss kit with speeded brake and some mud flaps. Guess what??
700 to 750kms to 130L of fuel and all that changed was the crap i installed.
You want fuel mileage you run smooth tires no lifts or anything bolted to the truck and keep as light as possible.
99 GMC 4x4 ext cab 454 with 155 000 km
Mods
custom duel exhaust
cats removed
K&N cold air intake
right side O2 sensor malfunction (leaning right bank out giving me 1-2 mpg better fuel milage)
ingnition syestem all new
Lucas syth oil in diffs and engine.....will do tranny when I service it one day!
stock drivetrain with 265/75/16 BFG AT, Automatic tranny with overdrive, box removed with custom Alum flat deck
now with the 454 my gas mileage should suck but on the highway doing between 100-130 KM/hr I get between 18-19 average.....I did get once 21 MPG empty......
18 MPG going from Sicamous to kelowna with a turbo yamy on the back is pretty much the norm!
but in town pulling my equipment I get about 9-11 mpg
here is a few calculations I have
661 km to 96 liters or 389 miles to 21.14 gallons = 18.40 miles per gallon on highway at 100-120km/hr with sled on. had to use jerry can to get me to gas station on this one! lol never leave home with out one! lol 14.5 liters/100km
358 km to 45 liters or 210.5 miles to 9.9 gallons = 21.26 MPG at highway speed empty! this has been one of my best! 12.57L/100km
since my engine light came on (right bank O2 sensor running rich so engine is trying to lean it out).....I got 1-2 more MPG so if I got a programmer or custom chip to lean out the other side I think I could get 22 MPG easy! I also heard the 454 likes a supercharger and if you stay out of the fun foot you can get another 2-3 mpg, but I just don’t want to F^$K with it since I'm getting great mileage.....for a gas engine
I don’t even want to post my in town figures....or a trip to Alberta with car trailer with 8400 pounds on it......these suck, but still pull the hills at 110 plus.....
I seem to get better all around gas mileage than a friend that has the exact same truck except his is a 96 with a 350 and he has his box on instead of my alum flat deck.....I get about 2-3 more miles per gallon with the 454.......but don’t get me wrong.....when my foot goes down so does the gas mileage. I was thinking about a diesel, but I thought if it breaks down, I have to pay some one to trouble shoot it and fix it......with my big block I do all my own work.....and a diesel I think cost more for maintenance.....plus all these new diesel need major work between 100 000-200 000 km....was thinking about an older 12v Cummings if I was going to go that way. but I got my GMC 454 with 123000 km last year and it is a great work truck for what I need it for.......plus 2 sleds fit on it great!