Ford Power Stroke Nation banner

1 - 3 of 3 Posts

·
Registered
Joined
·
177 Posts
Discussion Starter #1
took ex on a 900 mile round trip from sc to tennessee mountians this past week, mpg was 15.5 mixed driving, 15 hand calculated. question is, im running 35/12.50/16 bfg km2s which has my peedo off by 4 to 5 mph SLOWER than actual speed, how much off are my calculations based on the speedo being off...ANY IDEAS????????:D
 

·
Moderator
Joined
·
1,084 Posts
About what I'd expect of a 4x4, automatic, Ex with big tires and a lift operating in hilly terrain.
 

·
Registered
Joined
·
246 Posts
You're probably only calculating .95 miles per 1 mile. So if you averaged 15.5 on 40 gallons 620 miles. 620 x .05 = 31 620 + 31 = 651/40 = 16.275.

When on the freeway reset or take note of the trip computer number. When you get to the next mile marker see what you are at. Should be at 1.0 if you reset it. If it's off you should be between .9 and 1.0. If you are off 5mph, should be at .95.
 
1 - 3 of 3 Posts
Top