duneking905

i took my 5.0 for it's first highway spin with me behind the wheel. and almost immediately i see the gas gauge go down slowly. i've heard stock 5.0 get 17city and 24hwy. what are some suggestions. O and i was cruising between 65 and 70

86 5.0L

how do you know it was 10mpg? sometimes the gas gauge does its own thing

mjr46

if you see your gas gauge physically dropping that quick Einstien, then you got a huge leak and should see the trail behind you.......run a koer test and see if any rich codes come back, dirty maf, bad FP reg, bad o/2's are just some things that'll cause a rich condition

83glx5.0

I get about 9-15mpg in my stang. It does spend alot of time spining in one place and sliding sideways tho

duneking905

ill do that and maybe a tune up

Portmaster

What kind of mods on the car? A carbed 347 with 456 gears and a C6 Trans that would be good. A 302 with all factory stuff it would be bad.

PRO50SC

LOL mine does that and there are no leaks. But I think you know why!

duneking905

it has a K&N intake, Flowmasters, short throw shifter

5.0kid

i used to get around 22 on the highway when i had my tko600 not sure what it will get now since i just swapped to a c4

white93pony

id do a tune up check fuel filter and get some injector cleaner.... i used to get about 27-28 highway outta my 89 with a h/c/i and 3.73's....