No matter how much glow fuel is, it will still be cheaper than electric per flight. This is coming from a avid electric flyer. With our larger planes, batteries are expensive. The top brands are over $500 per set. True RC less than half that for a battery that weighs the same or less. (Most other cheap brands are much heavier). The track record of True RC is not really known yet in regargs to longevity. With your first electric flight on a new pack you will be overjoyed. Plenty of power, nice speed, less noise, no cleanup (my favorite), less vibration wear, much lower flight pack battery draw etc.
If you purchase a set of batteries (at least 2 probably 3) that start to lose their punch after 20 cycles, down 10 to 20% on max power you will start to realize why some people go back to glow after trying electric. The packs no longer pull over the top like they did when new that so impressed you on the first flights. Companies keep changing their cells (sometimes changing pack names, sometimes not) trying to find cells that hold up to our torture. Many many fliers will tell you of packs that lost their punch before even 50 flights. That is $10 per flight, and only an 8 minute flight at that. Of course many packs are holding up better than that, dropping the price per flight. One cell (I never owned any) that continues to get reported as higher than average cycle numbers is the TP pro lite 5300 packs. ( A newer version will be out soon)

I am hoping that True R/C finds the right cell as 2 5 cell 5000 packs are under $250 shipped. Hopefully the price from others will drop as well but it hasn't in the last couple of years as predicted.

I have no plans to switch away from electric. Perhaps if I was flying as much as I was in the 80's and early 90's I might change my mind

Stuart Chale