Summer mix fuel changeover - Fuel Economy, Hypermiling, EcoModding News and Forum

brucepick · 04-18-2008, 08:51 PM

I think that CT must have changed over to summer mix fuel on Apr. 15.

My mpg has been hovering just under 27 mpg since early March. This afternoon I tanked up and it came out at a hair under 30 mpg. Yes the afternoons have been warmer but a solid 10 % increase nearly overnight? I think the fuel changeover has occurred, at least in this state. Likely much of the Northeast is on the same schedule.

If you're watching for this in your mpg results - remember that you need to fill with the new stuff first, then you could notice results at the next fillup after that.

Arminius · 04-19-2008, 07:03 AM

That could explain why I'm getting 5 mpg more on my test route with a covered (on the interior) rear bumper. I thought I would get .5 more. Perhaps I got better gas, too.

basjoos · 04-19-2008, 10:01 AM

Same here. My tank average jumped from 68mpg to 75mpg and the typical daytime interstate cruising mileage jumped from around 72mpg to 80mpg. My new tires are nicely broken in with coasting performance equal or exceeding that of my old Michelin Harmony's, so I should see some good mpg figure this summer.

lovemysan · 04-19-2008, 10:48 AM

Quote:

Originally Posted by basjoos

Same here. My tank average jumped from 68mpg to 75mpg and the typical daytime interstate cruising mileage jumped from around 72mpg to 80mpg. My new tires are nicely broken in with coasting performance equal or exceeding that of my old Michelin Harmony's, so I should see some good mpg figure this summer.

what kind are they?

trebuchet03 · 04-19-2008, 11:47 AM

10% Ethanol stickers were recently put on my gas pumps... I've noticed a bit of a hit in FE... But I don't get winter gas as far as I know

Lazarus · 04-19-2008, 12:48 PM

Most of the studies I've seen have E10 at a 1-3% loss. Some places have E10 all year around.Here's one but it's from the ethonal folks. I've seen an increase in FE with Eoth in 2 cars, both small displacement. I think in general that the affect of E10 are over estimated and the affects of temperature is under estimated. YMMV (Your mileage may very)

trebuchet03 · 04-19-2008, 01:05 PM

Quote:

Originally Posted by Lazarus

Most of the studies I've seen have E10 at a 1-3% loss. Some places have E10 all year around.Here's one but it's from the ethonal folks. I've seen an increase in FE with Eoth in 2 cars, both small displacement. I think in general that the affect of E10 are over estimated and the affects of temperature is under estimated. YMMV (Your mileage may very)

That sounds about right - the aforementioned hit has been ~1.5mpg... Slightly higher than 3%, but it puts me under 35mpg which makes me sad

Lazarus · 04-19-2008, 01:10 PM

Quote:

Originally Posted by trebuchet03

That sounds about right - the aforementioned hit has been ~1.5mpg... Slightly higher than 3%, but it puts me under 35mpg which makes me sad

Maybe it will bounce back up once the ECU adjust

Arminius · 04-19-2008, 01:39 PM

Quote:

Originally Posted by trebuchet03

That sounds about right - the aforementioned hit has been ~1.5mpg... Slightly higher than 3%, but it puts me under 35mpg which makes me sad

Just be glad you don't use E85. Consumer reports found a 27% reduction in FE in one case.

http://www.consumerreports.org/cro/c...anol_ov1_1.htm

basjoos · 04-19-2008, 02:15 PM

Quote:

Originally Posted by lovemysan

what kind are they?

Sumitomo HTR T4 165/70/13