gas mileage - Page 2 - Ford Forums

boredford78 · 11-26-2001, 20:55

does anyone know this ........ i drive my 89 bronco down the road at 30 to 35 miles per hour and it shakes abut when i hit the gas and make the truck go alittle faster it seems to stop does anyone know why this is could it be the u joints

12-23-2001, 09:37

I have a 92 Bronco, 302 with 3:55 diffs and 31 x 10.5 tires. When I bought it last Spring, I was geeting 12.5 MPG City and 14 MPG City/Hwy. I added a K&N FIPK and the Jacobs Mileage Master ignition. I now get 15.75 combined City/Hwy and 18.5 Hwy. I also have a lot better low end torque. Next Spring I'm going to install the Flowmaster cat-back exhaust.

You actually might be getting better economy than you think. Has your speedo been re-calibrated for your larger diameter tires?
Mine has not, so I add 6% to both my mileage and my indicated MPH.

Here is a site that has a calculator to help you figure it out.

http://www.4lo.com/

boredford78 · 01-24-2002, 18:03

31x10.50x 15's are stock for my bronc and it still shakes around 30mph and jerks when it shifts over a gear and yes it is a auto and now i have to go to michigan to pick up a 76 f 250 4x4 that i got off ebay and i have to tow it with my bronco

remat457 · 01-29-2002, 23:35

hmm...good point..my Bronco didn't come with 31x10.5's originally. how did you come up with the 6% figure?

thanks,
reg

remat457 · 01-29-2002, 23:36

oops...i guess i should have read your entire message before posting! :)

i will check out the site...

thanks

tomahawk350 · 02-04-2002, 11:49

My '86 gets about 11 mpg around town. I would like it to be better, but the '95 in the above post gets the same so apparently it's the nature of the beast.

Anyone now what the tow rating is for a '86 with a 302?