really depends, which era of diesel are you looking at? idi or a stroker? will you be towing anything? auto or manual? do you drive like a bat out of hell (honestly)?
my dads 6.9 n/a gets about 15 being driven nicely 65 mph max, but it also doesn't get drove very far very often.
1973 f250 highboy 4x4 http://thelostdrifter.com/index.php/...ducing-trigger1984 full size bronco, -DIS, wide band megasquirted 300/ 8 speed
1988 f150 extended cab 4x4, mostly stock.
1984 mercury capri, 5.0 conversion, my little monster...
1961 ford falcon, all stock, in family since '68
I have seen early Powerstrokes (2wd E4OD) get 23 highway running empty. Because of the fundamentally different way diesels work vs gassers, mileage will vary more due to speed and load. That 23mpg truck drops down to 12 towing his trailer. Also, gearing is more important with diesels. 4.10's are really going to cost you if you like to cruise above 65.
You will get stunning gas mileage!
Put a five gallon can of gas in the bed of the truck and it will last 500k!
Now, diesel fuel mileage may be a little different.
My 3/4 ton ext cab short be 4wd regularly hvers at 18 or so around town and I have hit 22-23 on the highway with light loads and keeping the speed down to 60-65.
But 20 on the highway at 70+ is pretty common for me.
Pulling the camper, again depending on speed, I have done as well as 15-16 mpg of fuel.
The bottom line: PSD's have great fuel economy potential; your right foot is probably the greatest variable in the equation.
97 250 PSD Ex Cab Sd 4X4 ZF5 185k
Buncha low budget mods
"I tried being reasonable. I didn't like it."
2002 f-250 7.3, supercab shortbed, 6 spd, 4wd, 4in lift an 35's, custom tuned ts chip, 4" turbo back exhaust, 6637 intake, yada yada other goodies. IF i'm fairly easy on the gas, driving around 50/50 hwy/city, and 65-70 mph tops, I get 18 mpg. On longer hauls, up to 20 mpg.
Cory--689hp, 1340 ft-lbs
2002 F-250 SCSB 4x4 6spd, full custom air ride on 38'' Nittos, hyd steer assist, forged rods, 250/100, GQSSB turbo, Stage 1 cam, Tuned by Matt, 6637, CPR+ Reg Rreturn,140v IDM, South Bend DD 3600, Excursion aux fuel tank, ATI dampner, 26925 springs, SmithBro pushrods, 08 Seats, Big intercooler, CCV, Hutch & Harpoon, and alot more.
Originally Posted by jdecker88
Can't is not in Cory's vocabulary he's like Chuck Norris with a wrench
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