[carolina guy]

Originally Posted by Frank Lee

Short fills introduce large fill errors into the calcs. Unless there are enough entries to average those errors out, they are... well... prone to large error.

Even on a proper "full-fill", one tank does not a valid claim make. See: Sport Coupe.

I have all the information I need to make my call and you will not prove 21+ mpg at 75 mph. Your gas log shows a believable 17.x.

http://ecomodder.com/forum/showthrea...tml#post182705

http://ecomodder.com/forum/showthrea...g-16344-2.html

Again, I will have to give your "call" a (*shrug*) as being worth what I paid for it. :-)

But FWIW here is some logging I have done with my SGII (after installing the dual efans) over the last week (cannot find the other paper I was using before the spreadsheet) so this will have to do.

This is for a 43 mile each way commute using primarily I-485, I-77 and NC Hwy 49 in the Charlotte/Cabarrus County area. The speed limit for I-485 is 70MPH and it is NOT a good idea to go so slow during rush hour! I do, however, keep it just below the Misdemeanor level of 80+MPH per NC law.

32 Miles Interstate and 10 miles state highway and about 1 mile other roads:

Date // Inbound / Outbound // SG Avg // Coolant Efan Ran // AC // Outside Temp // CC Used // CC Speed // 485 Avg HI/LO speed

5/17/2016 IN 21.4 YES NO 61 NO 0 LO
5/16/2016 OUT 21.1 YES NO 74 YES 76 HI
5/12/2016 IN 20.8 YES NO 72 YES 75 HI
5/12/2016 OUT 19.9 NO YES 87 YES 77 HI
5/11/2016 IN 21.3 YES NO 71 YES 76 HI
5/11/2016 OUT 20.1 NO YES 82 YES 78 HI
5/10/2016 IN 20.9 NO NO 68 YES 75 HI
5/10/2016 OUT 20 YES YES 83 YES 75 HI
5/9/2016 IN 21.4 NO NO 61 YES 76 HI
5/9/2016 OUT 20.8 YES NO 79 YES 76 HI


This is VERY consistent with what I have seen...and this is with a 2004 Ford F150 4.6/Auto 4x2 Supercab no bed cover with nearly wornout street radials at max sidewall PSI. The extra columns are because I have a dual e-fan setup with one fan set to start at 184F and the second at either 195F or whenever the compressor is on.

I have not done (mostly because it is a PITA) short fills, and I agree...you never know where the pump is shutting off unless you use the same pump each time, at the same angle, etc.

I will update the fuel log to show that my AVERAGE city AND highway is about 17.1 mpg based on the last 5000+ miles, but as a caveat the above is the SGII observations from the daily commutes ONLY...and that is about 80% highway from a cold start. The fuel log shows weekend driving, evening driving with the family (wife and 4 kids) hauling whatever is purchased while out and idling around town.