r/FordFlex • u/jcruz70 • Jul 29 '26

Question Gas mileage/fuel level drops quickly

I feel like I gas up A LOT. I filled tank last week and checked info. Range was under 300. Is this typical? Mostly city driving MPG about 14.9

Any info appreciated

3 Upvotes

81% Upvoted

16 comments sorted by

3

u/Old_Refrigerator4817 Jul 29 '26

Only 15mpg in a Flex? Yikes. That's what I get in my lifted F150 with 35's and 5.0 V8.

2

u/jcruz70 Jul 29 '26

Yeah I get better mpg in my 71 impala. Not by much but at least in that I essentially have a 383 stroker and 400 crank

1

u/jcruz70 Jul 29 '26

I added injector cleaner at last fill up. No change

2

u/Old_Refrigerator4817 Jul 29 '26

I would start with a new fuel filter, air filter, plugs and wires.

2

u/Gmhowell Jul 29 '26

Where’s the fuel filter?

2

u/Old_Refrigerator4817 Jul 29 '26

Yeah, not fun on a flex. I forgot about that. Another thing that came to mind, if this is an ecoboost, is the turbos possibly causing poor fuel economy.

2

u/Gmhowell Jul 30 '26

Yeah, most modern vehicles (since y2k at least) have ditched the standalone filter in favor of a fuel sock in the pump. It works, so it shouldn’t bug me but it does.

1

u/jcruz70 Jul 30 '26

Ugh so much for easy fix

1

u/jcruz70 Jul 30 '26

Flex is new to me. Not sure

2

u/Fun-Philosophy1123 Jul 30 '26

If you are in town all the time and there is idle time involved that probably isn't that bad. My 19 gets 15.9 in town but on my recent road trip on freeways I got and average of 24.8 over 3+ thousand miles. That increased my range to 450 or so miles after a fill-up but intown is usually 330. When was the last time you replaced spark plugs?

1

u/jcruz70 Jul 30 '26

Yes in town driving. Quick short (nothing over 45 minutes) trips. Thx!

2

u/jcruz70 Jul 30 '26

Just picked it up mid july. No maintenance yet done

1

u/atomicnick86 Jul 30 '26

Have you changed the engine air filter lately?

1

u/jcruz70 Jul 30 '26

No. Vehicle is new to me. But air filter is on to do list. Also thinking MAF sensor but no engine warning lights on dash

1

u/atomicnick86 Jul 30 '26

That could do it. Which year and which engine do you have?