Hey I was wondering how much MPG do you think a 5.8 Liter 351 Windsor would get?

 

it depends on what has been done to it and what carb is on top

 

^oh thanks..

 

ok well im a newbie also to mustangs..just got into mustang since my bro bought his 93 Mustang 5.0 LX, but what do u mean by what kind of carburator and whats been done to it?

 

well what has been done meaning how many modifications, and the carburator will determine how much gas is put into the engine basically. The bigger the carb, the more gas, and usually the more power (don't go overboard on the carb tho).

I have a 351w but havn't been able to determine my mpg yet. Wouldn't be suprised if it was 12.

 

sadly mine will be around 12 on a good day

im just saying, a 351W with AFR heads and a nasty cam with a 700cfm carb you probably wont be getting more then 5mpg on race gas

but if your talking about a completely stock windsor around 1970 then it will probably be 12-15

 

Hahaha...do you really want to know the answer to that question? Mine, with a stock 4300 4v gets an average of 12 mpg, which is mostly city/country driving. If I were to drive on the highway I would expect it to get much better.

 

Fuel economy, is more than just carb and engine mods. A poorly tuned carb will affect mileage. You also have to consider transmission, gear ratio and tire diameter. My 351w has a roller cam, Holly Systemaxx II heads, 650 Speed Demon carb, T5, 3.50 gears, and 25" tall tires. The combo on the highway gets me almost 19 mpg in 5th gear.
My Cuda has a 318, holley 450 cfm carb, T5, 4.11 gears, 25" tall tires, 5th gear on the highway, 18 mpg.
My Falcon, had a 260 and 2 speed ford-o-matic, 2v carb, 3.0 gears, 25" tall tires, got me 13 mpg on the highway. Swapped in a roller 302, holley 450, T5, and 26" tall tires. 5th gear on the highway gets me 21mpg.
289, paxton 6lbs boost, 650 bouble pumper, 4 speed toploader, 3.55 gears, 25" all tires, =8mpg on the highway.
I calibrate my speedo after all my car mods that affect the odometer. If you change the rear end gears to highway gears you can gain a few more mpg. Taller tires will help, and overdrive.
My newest combo, 408, Vortech 15lbs boost,750 blow through Demon, Viper 6 speed, 3.70 gears and 25" tall tires. 6th gear @ 2000 rpm=80mph. I will be happy if I can get 14 mpg on the highway.

 

my 302 got about 8 with a lowly holley 4160 600

*edit* but my 06 GT with a tad over 300 HP gets about 21 driving around town and to work..... not too shabby for that kinda power

 

315W 2v, stock manifold, FMX transmission, 3.0 rear gears stock size tires - about 12.5 MPG depending how heavy my foot was.

changed to:

315W Edelbrock 4v, Edelbrock manifold, FMX transmission, 3.0 rear gears stock size tires - about 10.5 MPG depending how heavy my foot is.